2023 Edexcel IGCSE Geography 模擬試題連答案詳解

Hydraulic action refers to the physical force of the river water itself wearing away the banks and bed, especially when air becomes trapped in cracks and expands under pressure. Abrasion is the scraping of the bed by the load, attrition is the collision of rocks, and corrosion is chemical dissolution.

Award 1 mark for the correct option (A). No other options are acceptable.

Rivers transport sediment using four main processes: traction (rolling large rocks along the river bed), saltation (bouncing smaller pebbles), suspension (carrying fine particles within the water flow), and solution (dissolving soluble minerals).

Award 1 mark for any of the following valid river transportation processes: Traction (1), Saltation (1), Suspension (1), or Solution (1). Reject: Erosion processes (e.g., abrasion, hydraulic action).

Mass movement is the downslope movement of rock, regolith, and soil under the direct influence of gravity. Examples include landslides, rockfalls, rotational slumping, and soil creep.

Award 1 mark for: Mass movement (1). Also accept specific types of mass movement such as slumping (1), landslide (1), rockfall (1), or soil creep (1).

Constructive waves have a low frequency (6-8 waves per minute), are low in height, and have a strong swash and a weak backwash, which leads to the deposition of sediment on the beach.

Award 1 mark for any valid characteristic of a constructive wave: Strong swash / weak backwash (1), Low frequency / long wavelength (1), Low wave height (1), Deposits sediment / builds up the beach (1). Reject: Characteristics of destructive waves.

A drainage basin (or river basin) is the entire area of land drained by a river and its tributaries.

Award 1 mark for: Drainage basin (1) or River basin (1) or Catchment area (1). Reject: Watershed (which is the boundary separating drainage basins).

When river discharge is high, there is a larger volume of water moving at a faster velocity. This significantly increases the kinetic energy of the river. As a result, the water has more power to wear away the river bed and banks, enhancing erosion processes such as hydraulic action (forcing air and water into cracks) and abrasion (using transported sediment to scrape the channel).

Award 1 mark for identifying that high discharge increases the river's energy/velocity (1), and 1 mark for linking this to more effective erosion processes such as hydraulic action or abrasion (1).

Natural levees are formed when a river floods and overflows its banks. As the water spills out of the channel, its velocity decreases rapidly due to increased friction with the floodplain. This loss of energy causes the river to deposit its heaviest and coarsest load immediately adjacent to the channel. Over successive flooding events, these deposits build up to form raised ridges (levees) along the river banks.

Award 1 mark for explaining that flooding causes the river to lose energy/velocity as it overflows the channel (1). Award 1 mark for explaining that the heaviest/coarsest sediment is deposited first along the banks, building them up over time (1).

Longshore drift occurs when waves approach the coastline at an angle dictated by the prevailing wind direction. The swash carries sediment up the beach at this same angle. However, the backwash rolls straight down the beach at a 90-degree angle due to the pull of gravity. This continuous zig-zag movement gradually transports sediment along the shoreline.

Award 1 mark for describing the angled movement of the swash up the beach due to prevailing wind (1). Award 1 mark for describing the straight movement of backwash down the beach due to gravity, creating a zig-zag transport path (1).

Groynes are wooden or stone barriers built at right angles to the shore. They block and trap sediment that is being transported along the coast by longshore drift. This traps sand, leading to the build-up of a wider and higher beach on the updrift side. The wider beach then acts as a natural buffer, absorbing the energy of incoming waves and preventing them from reaching and eroding the cliffs behind.

Award 1 mark for identifying that groynes trap sediment transported by longshore drift to build up a wider beach (1). Award 1 mark for explaining that the wider beach absorbs wave energy, which reduces erosion of the cliffs behind (1).

Helicoidal flow moves faster water to the outer bend of the meander, causing lateral erosion through hydraulic action and abrasion, which undercuts the bank to form a river cliff. Conversely, water velocity is lower on the inner bend, leading to the deposition of sand and shingle to form a point bar or slip-off slope. Over time, this combination of outer-bend erosion and inner-bend deposition causes the entire bend to migrate sideways across the valley floor.

Award 1 mark for each linked explanation point up to a maximum of 3 marks: 1 mark for explaining that faster flow on the outer bend causes lateral erosion and river cliff formation; 1 mark for explaining that slower flow on the inner bend causes deposition and point bar formation; 1 mark for linking these opposing processes to the gradual lateral migration of the channel over time.

Destructive waves attack the base of a cliff between high and low tide levels, eroding it through hydraulic action and abrasion to create a wave-cut notch. As this notch deepens over time, the cliff face above becomes unsupported and eventually collapses under the force of gravity. Repeated undercutting and collapse causes the cliff to retreat inland, leaving behind a gently-sloping rocky platform at its base visible at low tide.

Award 1 mark for each linked explanation point up to a maximum of 3 marks: 1 mark for identifying the formation of a wave-cut notch at the high/low tide mark due to marine erosion; 1 mark for explaining the collapse of the overhanging cliff face due to lack of support; 1 mark for describing the parallel retreat of the cliff line, leaving behind a gently sloping rocky platform.

Prevailing winds blow waves at an oblique angle to the shoreline, carrying sediment up the beach as swash, while gravity pulls backwash straight down, resulting in longshore drift. When the coastline changes direction, such as at an estuary mouth, the sediment continues to be transported in the original direction into deeper, calmer water. The loss of wave energy causes this sediment to be deposited, gradually building up a linear ridge of sand or shingle extending out from the land.

Award 1 mark for each linked explanation point up to a maximum of 3 marks: 1 mark for explaining how swash and backwash transport sediment along the beach at an angle; 1 mark for identifying a change in coastline direction or decrease in wave energy that causes deposition; 1 mark for explaining the accumulation and growth of the deposited sediment to form a linear ridge projecting into open water.

Removing trees reduces the amount of rainfall intercepted by leaves and branches, meaning more water reaches the ground directly. With fewer tree roots taking up water from the soil, the soil becomes saturated much faster, significantly increasing surface runoff. Consequently, a larger volume of water reaches the river channel in a shorter amount of time, increasing the peak discharge and the overall risk of flooding.

Award 1 mark for each linked explanation point up to a maximum of 3 marks: 1 mark for explaining that deforestation reduces interception of rainfall or transpiration; 1 mark for linking this to faster saturation of the soil and increased surface runoff; 1 mark for explaining that more water reaches the river channel rapidly, causing a higher peak discharge or shorter lag time.

Deforestation leads to a decrease in interception because there is less vegetation to catch precipitation. This results in more water reaching the ground surface directly. Additionally, because there are fewer tree roots to absorb moisture and create channels in the soil, the soil quickly becomes saturated, reducing its infiltration capacity. Consequently, precipitation flows rapidly over the land as surface runoff (overland flow) rather than infiltrating into the groundwater storage. This direct and rapid transfer of water into river tributaries significantly shortens the lag time and causes a rapid increase in the river's discharge, exceeding the channel capacity and causing flooding downstream.

Award 1 mark for identifying a primary impact of deforestation on the hydrological cycle (e.g., reduced interception, reduced infiltration) and up to 3 further marks for explaining the knock-on effects leading to flooding. [1 mark] Deforestation reduces interception, meaning more water reaches the ground. [1 mark] This leads to increased surface runoff / overland flow as soil saturated capacity is reached. [1 mark] Water reaches the river channel much faster, shortening the lag time. [1 mark] This causes peak discharge to exceed bankfull capacity, resulting in a flood.

Longshore drift is the movement of sediments along a coast. The prevailing wind dictates the direction of the incoming waves, causing them to approach the shore at an oblique angle. As a wave breaks, the swash moves up the beach at this same angle, carrying sediment with it. As the water loses energy, gravity pulls the backwash straight down the beach slope at a 90-degree angle to the coastline, carrying sediment back down. This continuous cycle of angled swash and perpendicular backwash moves individual sediment particles in a zigzag pattern along the shoreline in the direction of the prevailing wind.

Award 1 mark for each step explained in the sequence of sediment transport, up to a maximum of 4 marks. [1 mark] Prevailing wind causes waves to approach the coast at an oblique angle. [1 mark] Swash carries sediment up the beach at this angle. [1 mark] Backwash pulls sediment straight back down to the sea at a right angle due to gravity. [1 mark] This creates a continuous zigzag movement of material along the coastline.

The formation of a wave-cut platform begins when destructive waves attack the base of a cliff, particularly during high tide and storms. Marine erosion processes, such as hydraulic action and abrasion, erode a groove or wave-cut notch into the foot of the cliff. As the notch deepens over time, the weight of the cliff above becomes unsupported. Eventually, the overhanging rock collapses under gravity. This process of undercutting and collapse repeats continuously, causing the cliff line to retreat gradually inland. The flat or gently sloping bedrock left behind at the base of the retreating cliff is the wave-cut platform, which is often exposed at low tide.

Award 1 mark for explaining each step of the geological process, up to a maximum of 4 marks. [1 mark] Marine erosion (hydraulic action or abrasion) attacks the base of the cliff. [1 mark] This forms a wave-cut notch at the high-water mark. [1 mark] The overhanging cliff loses support and collapses under gravity. [1 mark] The cliff retreats inland over time, leaving a gently sloping wave-cut platform at its base.

At a conservative (transform) plate boundary, two tectonic plates slide past each other horizontally, either in opposite directions or in the same direction at different speeds. Because plate margins are not perfectly smooth, friction causes them to snag, lock, and become stuck. Even though the boundary is locked, convection currents in the mantle continue to apply force, causing massive elastic strain and stress to build up in the crustal rocks over time. When the accumulated stress finally exceeds the frictional strength holding the plates together, there is a sudden slip or fracture along the fault line. This sudden movement releases the built-up strain energy instantly as seismic waves, which travel through the Earth's crust, causing the ground shaking we experience as an earthquake.

Award 1 mark for each distinct stage explained in the earthquake formation process, up to a maximum of 4 marks. [1 mark] Plates slide past each other horizontally (in opposite directions or at different speeds). [1 mark] Friction causes the plate margins to become locked or stuck together. [1 mark] Convection currents cause a continuous buildup of pressure, strain, or tension along the fault. [1 mark] The sudden release of this built-up energy creates shock/seismic waves through the crust.

To structure an 8-mark 'Analyse' answer, candidates must provide detailed chains of reasoning linking basin characteristics to the hydrograph features (peak discharge, lag time, and shape of the rising limb) shown in Figure 1.

**Analysis of Basin A (Flashy Hydrograph):**
* **Human Characteristics (Urbanisation):** Urban areas feature impermeable concrete and tarmac surfaces, which prevent infiltration. Gutters, drains, and storm sewers are designed to transport precipitation directly and rapidly into the river channel. This accelerates the hydrological response, resulting in a steep rising limb and a very short lag time (3 hours).
* **Physical Characteristics:** Basin A may have steep slopes, which increase the speed of overland flow (surface runoff) under gravity. Additionally, if the basin has thin clay soils or impermeable crystalline geology (such as granite), infiltration is highly restricted, forcing water to flow rapidly over the surface to reach the channel, resulting in a high peak discharge of 45 m³/s.

**Analysis of Basin B (Subdued Hydrograph):**
* **Physical Characteristics (Vegetation/Forestry):** Basin B is likely heavily vegetated or forested. Trees and plants intercept incoming rainfall on their leaves and branches. This water then undergoes evaporation or is delayed through stemflow and drip, reducing and slowing the volume of water reaching the forest floor.
* **Soil and Geology:** Permeable soils (such as sand or loam) and porous rock (such as sandstone) allow high rates of infiltration and percolation. Water is diverted into slower subsurface pathways—throughflow and groundwater flow—rather than rapid surface runoff. This significantly extends the lag time to 14 hours and dampens the peak discharge to 12 m³/s, creating a gentle, gradual rising limb.

**Level 1 (1–3 marks):** Identifies basic physical/human factors (e.g., trees, tarmac) but lacks logical chains of reasoning. Describes the hydrograph differences simply without linking them clearly to the processes.
**Level 2 (4–6 marks):** Offers some structured chains of reasoning linking basin features (like urban surfaces or vegetation) to hydrological processes (such as surface runoff, infiltration, or interception). Refers to the resource (e.g., peak discharge values, lag times) to support points.
**Level 3 (7–8 marks):** Explains fully developed, balanced, and logical chains of reasoning for both Basin A and Basin B. Successfully demonstrates how specific characteristics alter flow pathways (surface runoff vs subsurface flow), directly connecting these to the quantitative data in Figure 1 (3 vs 14 hours lag, 45 vs 12 m³/s peak).

Candidates should apply their understanding of coastal transport and deposition processes to explain the development and features of the spit shown in Figure 2.

* **Longshore Drift (Transportation):** The prevailing wind from the South-West determines the direction of incoming waves. The swash carries sediment up the beach at an angle (South-West to North-East). As the wave energy dissipates, gravity pulls the backwash directly down the beach gradient at a 90-degree angle. This continuous zig-zag movement of sand and shingle along the beach is called longshore drift.
* **Deposition and Morphology Change:** Where the coastline changes direction (from East-West to North-South), the water becomes sheltered and shallow, causing wave energy to drop significantly. Because the waves can no longer transport the sediment load, deposition occurs. Sediment builds up and extends out into the estuary mouth, continuing the original line of the coast.
* **Formation of the Recurved End (Hook):** The spit does not grow completely across the estuary due to the outward flow of the river current, which sweeps sediment away. However, the shape of the spit is modified by secondary winds or waves approaching from a different direction (e.g., North or East). These waves cause wave refraction around the end of the spit, pushing the deposited material landward to form a curved lateral hook.
* **Low-Energy Environment:** Behind the shelter of the spit, a low-energy environment develops where fine silt and mud are deposited, often leading to the formation of a salt marsh.

**Level 1 (1–3 marks):** Outlines basic coastal processes (e.g., longshore drift, swash, backwash) but struggles to explain the link between wind direction, coast shape, and the formation of the spit. May simply list features of Figure 2.
**Level 2 (4–6 marks):** Connects the oblique wind/wave direction with the zig-zag movement of sediment (longshore drift). Explains why deposition occurs at the change in coastline direction and references the recurved hook using Figure 2 details.
**Level 3 (7–8 marks):** Provides a highly coherent, sequential analysis showing how the wind, wave angles, and coastal shape interact. Fully explains the mechanics of longshore drift, the role of river currents in keeping the estuary open, and the secondary processes (wave refraction/wind changes) that create the recurved end.

One common method to measure river velocity is the float method. A set distance, such as 10 metres, is measured and marked along the river bank using a tape measure. A floating object, like an orange peel or tennis ball, is then released at the upstream marker, and a stopwatch is used to record the exact time in seconds it takes to reach the downstream marker. This speed calculation is often repeated across different points of the channel to find an average.

Award 1 mark for identifying a valid piece of equipment or method, and 1 mark for describing how it is used to collect the velocity measurement. For example: Measure a fixed distance along the river bank with a tape measure (1) and record the time it takes for a float to travel that distance using a stopwatch (1). Alternatively: Place a digital flow meter into the river channel facing upstream at a specific depth (1) and record the velocity reading shown on the digital display (1).

One benefit is that an impeller measures velocity at a specific depth beneath the surface, making it more accurate (1). A floating object, such as a cork or orange, only measures surface velocity and is easily affected by wind (1). This means the impeller provides a more reliable reflection of the true average velocity of the river flow without external atmospheric interference (1).

Award 1 mark for identifying a valid benefit, and up to 2 further marks for explaining this benefit. For example: Impeller is submerged and measures flow below the surface (1); this is not influenced by wind resistance (1); unlike a floating object which can be blown off course or speeded up by wind (1). Alternatively: The impeller's digital readout reduces human reaction time error (1); which occurs when timing a float over a distance with a stopwatch (1); leading to more precise and repeatable data (1).

Systematic sampling involves selecting sample sites at regular, fixed intervals, such as every 10 metres along the beach (1). This ensures that the entire length of the shoreline is evenly represented in the data collection (1). Furthermore, it removes researcher bias or subjectivity in choosing where to measure, leading to more reliable and objective geographical data (1).

Award 1 mark for identifying a reason why systematic sampling is suitable, and up to 2 further marks for explaining this reason. For example: It uses a fixed, regular interval (e.g., every 10m) (1); which ensures the entire length of the beach is covered representatively (1); preventing clustering of data in only one area (1). Alternatively: It removes subjectivity or bias from site selection (1); because the points are predetermined mathematically (1); making the final statistical analysis more reliable (1).

Secondary data provides access to long-term historical records (such as past meteorological office data) that students cannot collect themselves during a short field trip (1). This allows students to establish baseline conditions or average patterns for the area (1). As a result, they can compare their primary field observations against these records to determine the severity or return period of the hazardous weather event (1).

Award 1 mark for identifying a valid reason or importance of secondary data, and up to 2 further marks for explaining this reason. For example: Gives access to long-term historical records (1); allowing students to establish baseline climatological patterns (1); which helps determine if their primary data represents an extreme or normal event (1). Alternatively: Allows access to professional equipment data (such as satellite or radar) (1); which is much more accurate than school instruments (1); increasing the validity of the enquiry's conclusions (1).

Candidates can refer to either a river enquiry or a coastal enquiry. Exemplar response based on a coastal enquiry: My enquiry question was: 'How does beach sediment size and shape change along a beach with coastal defences at Highcliffe?' We used systematic sampling to measure beach profiles and pebble characteristics. Ranging poles, a tape measure, and a clinometer were used to measure the beach profile at 10-meter intervals. This was highly effective as it provided a clear, quantitative cross-section showing distinct beach berms. However, accuracy was limited by human error in aligning the clinometer and ranging poles sinking into sand. To measure pebble characteristics, we used a quadrat at each interval and measured 10 random pebbles using callipers and Power's Scale of Roundness. Callipers gave precise measurements of the long axis, reducing subjectivity. However, subjective bias still occurred when selecting 'random' pebbles, as students tend to select larger stones. In conclusion, our primary data collection methods were highly effective because they allowed us to gather precise, quantitative data that clearly answered our enquiry question, despite minor errors in clinometer use and pebble sampling bias which could be improved using digital clinometers and random number tables.

Level 1 (1-3 marks): Identifies primary methods but descriptions are basic. Evaluation is limited, lacks structure, and does not link clearly to the enquiry question. Level 2 (4-6 marks): Explains some strengths and weaknesses of the methods used (e.g. equipment accuracy, sampling strategies). Structure is logical and evaluates some aspects of effectiveness. Attempts a conclusion. Level 3 (7-8 marks): Detailed and balanced evaluation of the strengths and weaknesses of the primary data collection methods. Strong chains of reasoning, linking the effectiveness of the methods directly to the validity of the enquiry's overall conclusions.

Quaternary activities are knowledge-based and include services such as scientific research, information technology development, and high-tech consulting. Primary activities involve raw extraction (a), secondary activities involve manufacturing (b), and tertiary activities involve standard services (c).

Award 1 mark for identifying the correct definition of a quaternary economic activity (option d). No marks are awarded for incorrect options.

Uranium is a finite mineral resource mined from the crust. Once consumed, it cannot be easily replenished on a human timescale, making nuclear power based on uranium a non-renewable energy source. Geothermal, biomass, and hydroelectric are all renewable.

Award 1 mark for the correct answer (option c). No marks are awarded for options a, b, or d.

Counter-urbanisation refers to the demographic and social process whereby people move from urban areas to rural areas. Suburbanisation is the outward growth of cities into surrounding suburbs. Re-urbanisation is the movement of people back into central urban areas.

Award 1 mark for identifying counter-urbanisation as the correct term (option b). Other options are incorrect.

The informal sector (or informal economy) comprises jobs that are not officially recognized, registered, or taxed by the government. Workers lack employment contracts, fixed wages, and social security benefits. Options a, b, and d are features of the formal sector.

Award 1 mark for identifying the correct characteristic of informal sector employment (option c). No marks for options a, b, or d.

Global energy demand is rising primarily due to a growing global population and economic development, especially in emerging economies, leading to higher living standards and increased industrial production.

Award 1 mark for any of the following valid reasons: Population growth or more people needing energy (1); Economic development or industrialisation (1); Rising living standards or increased use of electrical appliances (1).

Push factors are negative aspects of a rural area that encourage people to leave. These include a lack of employment options, low agricultural productivity, crop failures, or poor access to services like healthcare and education.

Award 1 mark for a valid push factor, such as: Low wages or lack of job opportunities (1); Crop failure or drought (1); Poor access to services like schools and hospitals (1); Extreme weather events or natural hazards (1).

Rural diversification involves finding alternative ways for a farm to generate income beyond traditional agriculture. Examples include starting a farm shop, offering recreational activities like campsites, or converting farm buildings into commercial units or holiday accommodation.

Award 1 mark for a valid example of farm diversification, such as: Opening a farm shop or selling directly to the public (1); Setting up a campsite, caravan park, or holiday cottages (1); Creating a farm attraction or petting zoo (1); Generating renewable energy such as wind turbines or solar panels (1).

Informal employment refers to jobs and economic activities that are outside the formal sector. They are not regulated by the government, workers do not pay taxes on their earnings, and they lack legal protections and employee benefits.

Award 1 mark for a clear definition containing the key idea of unregulated or untaxed work: Work that is not regulated, monitored, or taxed by the government (1); Unofficial jobs without a contract or employment benefits (1).

The candidate identifies a valid reason for the decline in primary sector employment in HICs (1 mark) and provides a linked explanation demonstrating how this reduces the labor force needed (1/2 marks).

Award 1 mark for identifying a valid reason, and 1 mark for a linked explanation (1+1 marks). Suggested answers:
- Mechanisation (1) which means machines like tractors and combine harvesters replace manual labor, reducing the demand for workers (1).
- Resource depletion (1), meaning coal or ore mines are exhausted, leading to mine closures and job losses (1).
- Cheap imports of food or raw materials (1), making domestic primary industries unprofitable so businesses close down (1).

Candidates need to identify one distinct advantage of brownfield sites (1 mark) and explain how this benefits the developer, city planning, or the environment (1 mark).

Award 1 mark for identifying a valid advantage, and 1 mark for a linked explanation (1+1 marks). Suggested answers:
- Existing infrastructure is already present (1), which lowers the initial costs and speed of construction for developers (1).
- Prevents urban sprawl (1), preserving open green space and ecosystems on the rural-urban fringe (1).
- Close to city centres (1), which reduces commute times and encourages public transport use (1).

Candidates must state a reason for farm diversification (1 mark) and provide a linked explanation showing how it improves the farm's financial resilience or utilizes assets (1 mark).

Award 1 mark for identifying a valid driver/reason for diversification, and 1 mark for a linked explanation (1+1 marks). Suggested answers:
- Low profit margins on traditional crops (1), meaning farms must find other income sources like farm shops to stay financially viable (1).
- Seasonal income gaps (1), so opening tourist accommodation or caravan sites provides a steady year-round cash flow (1).
- Changing government subsidies (1), which encourages farmers to use land for leisure or conservation to receive new funding (1).

Candidates should identify a key driver of rising global energy demand (1 mark) and explain how this leads to greater consumption of energy (1 mark).

Award 1 mark for identifying a valid reason for increased energy demand, and 1 mark for a linked explanation (1+1 marks). Suggested answers:
- Rapid economic development in emerging economies (1), which increases industrial activity and factory production that consumes vast power (1).
- Global population growth (1), meaning more homes require electricity for daily needs like heating, cooling, and cooking (1).
- Rising disposable incomes (1), allowing more people to buy cars, electronic devices, and air conditioning units that require energy (1).

1. Access to highly skilled labor and research: Being close to universities allows easy recruitment of specialized graduates and collaboration with research departments. 2. Infrastructure sharing: Science parks provide purpose-built facilities like high-speed telecommunications and laboratories, reducing individual setup costs. 3. Agglomeration economies: Proximity to similar firms creates a cluster of expertise, attracting venture capital and facilitating knowledge sharing.

Award 1 mark for each valid reason explained, up to a maximum of 3 marks (3 x 1 mark).

1. Rapid industrialisation: The transition from primary agriculture to manufacturing means more factories, machinery, and heavy industry requiring continuous electricity. 2. Rising living standards: Increased disposable income allows households to purchase and use energy-intensive goods like cars, air conditioning, and electronics. 3. Urbanisation: Growth of cities expands access to electrical grid infrastructure, which increases domestic consumption compared to off-grid rural areas.

Award 1 mark for each explained point linking economic/social development to rising energy demand, up to a maximum of 3 marks (3 x 1 mark).

1. Out-of-town shopping habits: New affluent residents often work in cities and do their shopping there, bypassing local rural services and causing them to close due to low revenue. 2. House price inflation: High demand from urban migrants drives up property prices, making homes unaffordable for younger local families. 3. Loss of young families: As younger populations leave, the threshold population for services like local primary schools and nurseries falls below a viable level, leading to closures.

Award 1 mark for an initial point (e.g. commuters shopping elsewhere / house price inflation) and up to 2 further marks for explaining the knock-on effects on rural services (1 + 1 + 1). Max 3 marks.

1. Rapid rural-to-urban migration: High rates of urban migration outpace the municipal capacity to plan and build affordable housing. 2. Widespread poverty: Migrants often work in low-paid, informal jobs, leaving them without the savings or formal credit required to access legal housing markets. 3. Availability of marginal land: Unable to afford legal land, migrants settle illegally on high-risk, steep, or swampy areas that are left unused by formal developers.

Award 1 mark for each factor identified and explained (1 + 1 + 1). Max 3 marks.

High-technology industries often locate in science parks due to:
1. Proximity to research universities: This provides companies with a direct pipeline of highly skilled, specialist graduates and opportunities for collaborative research and development.
2. Agglomeration economies and networking: Clustering with similar high-tech firms allows for knowledge sharing, collaboration, and the shared use of expensive, specialized infrastructure such as superfast broadband and laboratories.

Award 1 mark for identifying a valid reason, and 1 mark for further explanation/development, up to a maximum of 4 marks (2 x 2 marks).

- Proximity to universities (1 mark) which allows companies to recruit highly qualified graduates or collaborate on cutting-edge research (1 mark).
- Agglomeration/clustering of similar businesses (1 mark) which allows for the sharing of ideas, specialized support services, and infrastructure (1 mark).

Rapid urbanisation in emerging or developing countries causes major environmental issues:
1. Water pollution: The rapid growth of informal settlements outpaces the development of formal sewage networks, leading to untreated household and industrial waste being dumped directly into local water sources.
2. Air pollution: Rapidly expanding urban areas experience high traffic congestion from older, poorly maintained vehicles and unregulated industrial output, leading to severe smog and deteriorated air quality.

Award 1 mark for identifying a valid environmental challenge, and 1 mark for explaining how it is caused by or linked to rapid urbanisation, up to a maximum of 4 marks (2 x 2 marks).

- Inadequate waste/sewage infrastructure (1 mark) leads to raw sewage dumping, which pollutes local rivers and water tables (1 mark).
- Rapid increase in vehicle ownership and congestion (1 mark) leads to high emissions of particulate matter and toxic gases, causing poor air quality/smog (1 mark).

Commercial farming degrades the environment in several ways:
1. Chemical runoff: The intensive application of artificial fertilizers and pesticides can wash into nearby streams and lakes during rainfall, causing eutrophication, algae blooms, and the subsequent suffocation of aquatic life.
2. Habitat loss: To maximize crop yield and accommodate large machinery, vast areas of natural vegetation and hedgerows are cleared (deforestation), destroying ecosystems and significantly reducing local biodiversity.

Award 1 mark for identifying a commercial farming practice/impact, and 1 mark for explaining how it leads to environmental degradation, up to a maximum of 4 marks (2 x 2 marks).

- Intensive use of chemical fertilizers (1 mark) which run off into local watercourses, causing eutrophication and loss of aquatic life (1 mark).
- Clearing large areas of natural habitat to make space for monoculture fields (1 mark) which destroys native ecosystems and reduces biodiversity (1 mark).

Renewable energy sources offer significant environmental benefits compared to fossil fuels:
1. Zero greenhouse gas emissions: Unlike coal or gas, renewable sources like wind and solar do not release carbon dioxide during electricity generation, which helps slow down global warming and climate change.
2. Reduction in air pollution: Renewable technologies do not emit harmful pollutants such as sulphur dioxide or nitrogen oxides, which directly reduces the occurrence of acid rain and improves local air quality.

Award 1 mark for identifying an environmental advantage, and 1 mark for explaining how this benefits the environment compared to using fossil fuels, up to a maximum of 4 marks (2 x 2 marks).

- Renewables do not release greenhouse gases during operation (1 mark), which helps mitigate global warming and climate change (1 mark).
- They do not emit toxic air pollutants like sulphur dioxide (1 mark), which reduces the formation of acid rain and protects forests and aquatic ecosystems (1 mark).

Analyse how the employment structure of Country Y changed between 1990 and 2020, linking the data trends to geographical concepts:

1. **Primary Sector Analysis**: There was a significant drop of 35 percentage points (45% to 10%). This is typical of a country undergoing rapid development, where agricultural mechanisation reduces the demand for manual labour, and rural-to-urban migration pulls workers into urban areas.
2. **Secondary Sector Analysis**: This sector decreased by 10 percentage points (35% to 25%). This indicates a shift away from traditional manufacturing, possibly due to automation, outsourcing, or the country moving into a post-industrial phase where service industries dominate.
3. **Tertiary Sector Analysis**: The tertiary sector experienced massive growth of 45 percentage points (from 20% to 65%), becoming the dominant employment sector. This is driven by economic development, rising incomes, and a growing demand for consumer services, finance, education, and healthcare.
4. **Overall Synthesis**: The structural shift clearly illustrates the process of economic sectoral transition (Clarke-Fisher model) from an agricultural-based economy to a service-based economy.

Levels of response marking scheme:

- **Level 1 (1–2 marks)**: Identifies basic changes in the data without clear links to geographical theory. Uses isolated figures with little comparison or synthesis.
- **Level 2 (3–5 marks)**: Explains the trends with some geographical reasoning (e.g., mentions mechanisation or urbanisation). Makes clear comparisons using the data provided to show trends over time.
- **Level 3 (6–8 marks)**: Demonstrates a detailed, logical analysis of all three sectors. Integrates geographical theories (such as the Clarke-Fisher model of sectoral change) to explain the structural transition, supported by precise manipulation of the data (e.g., calculation of percentage point changes: primary -35%, secondary -10%, tertiary +45%).

To structure a high-scoring response:

1. **Deconstruct the Relationships**: Compare the variables across the zones. High land value does not automatically mean high environmental quality (e.g., CBD has Very High land value but only 5/10 EQI).
2. **Zone-by-Zone Analysis**:
- **CBD**: Very High land value is driven by commercial demand, accessibility, and competition for space, despite moderate environmental quality (5/10) caused by high traffic density and lack of green space.
- **Inner City**: The lowest EQI (2/10) reflects older housing, derelict industrial sites, and congestion. Land values are medium due to proximity to the centre but depressed by environmental blight.
- **Suburbs**: High land value (High) correlates with high EQI (8/10), reflecting suburbanisation trends where middle-to-high-income residents pay a premium for larger homes, gardens, and cleaner air.
- **Rural-urban Fringe**: Low land value reflects its distance from the economic centre, but has the highest EQI (9/10) due to abundant green space and lack of urban pollution.
3. **Synthesis**: Conclude that environmental quality increases with distance from the city centre, whereas land value peaks at the centre (CBD), dips in the inner city, rises again in the affluent suburbs, and falls at the periphery.

Levels of response marking scheme:

- **Level 1 (1–2 marks)**: Simple description of the zones or data. Mentions isolated facts (e.g., 'Inner City has EQI of 2/10') with no clear attempt to link variables.
- **Level 2 (3–5 marks)**: Identifies some relationships (e.g., environmental quality gets better further out, or land value peaks in the CBD). Explains these patterns with basic geographical reasons like congestion or green space.
- **Level 3 (6–8 marks)**: Shows a detailed and balanced analysis of the multi-way relationships. Combines concepts of urban bid-rent curves with environmental factors (suburbanisation, deindustrialisation) to explain why land value and EQI patterns diverge in the CBD and inner city versus the suburbs and rural-urban fringe.

An Environmental Quality Survey (EQS) is a primary data collection method where researchers observe and score different environmental aspects (such as noise, litter, and air quality) of a location using a bi-polar scale.

Award 1 mark for any valid primary data collection method: Environmental Quality Survey (EQS) or Environmental Quality Index (EQI) (1); Decibel or noise level meter readings (1); Litter count or survey (1); Traffic or pedestrian count (if linked to congestion or pollution) (1). Do not accept secondary data collection (such as online reviews or local council reports).

Systematic sampling involves choosing residents at regular intervals, such as every 5th house along a street, which helps to reduce bias from the selection process.

Award 1 mark for a valid sampling technique: Systematic sampling (1); Stratified sampling (1); Random sampling (1); Opportunity or convenience sampling (1). Reject terms that describe data collection methods rather than sampling techniques (such as questionnaire or interview).

In a busy CBD, heavy traffic poses a high risk of collisions or accidents, so students must plan safe crossing points and stay on pedestrian paths.

Award 1 mark for any valid hazard or risk relevant to an urban CBD environment: Traffic or crossing busy roads (1); Getting lost or separation from the group (1); Large crowds or personal safety/theft (1); Adverse weather conditions (1). Do not accept risks that are unrelated to a city-centre environment (such as drowning or rockfalls).

1. Sum the EQI scores recorded at the five sites:
\(3 + (-1) + 4 + 2 + 2 = 10\)

2. Divide the total sum by the number of sites (5):
\(10 / 5 = 2\)

Award 1 mark for showing correct working:
- \(\frac{10}{5}\) or \(\frac{3 - 1 + 4 + 2 + 2}{5}\)

Award 1 mark for the correct final answer:
- 2 (or 2.0)

Do not award the final accuracy mark if the calculation is incorrect, but allow 1 mark if the method is correct.

1. Find the absolute increase in pedestrians:
\(270 - 120 = 150\)

2. Divide the increase by the original 09:00 value and multiply by 100 to find the percentage:
\(\frac{150}{120} \times 100 = 125\%\)

Award 1 mark for correct working:
- \(\frac{270 - 120}{120} \times 100\) or \(\frac{150}{120} \times 100\)

Award 1 mark for the correct final answer:
- 125% (accept 125)

Systematic sampling involves choosing sites at regular, pre-defined intervals (for example, every 200 metres along a transect). This eliminates personal bias, as the researcher cannot deliberately choose 'better' or 'worse' looking locations to survey. It ensures that the gradient of change from the CBD to the suburbs is captured evenly and objectively.

Award 1 mark for identifying a valid advantage, and a further 2 marks for explaining how this advantage is achieved and its benefit to the geographical enquiry (1+1+1).

Example response:
- It avoids researcher bias/subjectivity in choosing locations (1) because sites are selected at fixed, pre-determined intervals (e.g. every 100m) (1), which ensures the data collected represents an objective, even cross-section of the transect (1).

Accept other valid explanations, such as ease of planning/organisation or ensuring full coverage of the study area, provided they are developed to 3 marks in the context of an urban transect.

To achieve Level 3 (7-8 marks), the candidate must:
1. Clearly state a relevant human geography fieldwork title (e.g., 'An investigation into how environmental quality varies with distance from the CBD in Newcastle').
2. Evaluate at least two primary data collection methods (e.g., Environmental Quality Surveys, pedestrian counts, questionnaires, decibel measurements, or land-use mapping).
3. Discuss both strengths and weaknesses (effectiveness) of these methods in relation to accuracy, reliability, and sampling strategies.
4. Make a reasoned, balanced judgment/conclusion on the overall effectiveness of these methods in enabling valid conclusions to be drawn.
5. Use precise geographical and fieldwork-specific terminology throughout (e.g., systematic sampling, subjective bias, quantitative data, anomalies).

Level 1 (1-3 marks):
- Demonstrates isolated knowledge and understanding of fieldwork methodologies.
- Explains primary data collection methods with limited detail, mostly descriptive with little or no evaluation.
- No clear judgment made regarding the effectiveness of the methods.

Level 2 (4-6 marks):
- Demonstrates good geographical knowledge and understanding of the fieldwork processes.
- Evaluates the effectiveness (strengths and/or weaknesses) of at least two methods, but the analysis may be unbalanced.
- Offers a basic conclusion/judgment about the quality or reliability of the data collected, but this may lack support.

Level 3 (7-8 marks):
- Demonstrates detailed, accurate, and coherent geographical understanding of the chosen fieldwork enquiry.
- Provides a balanced and logical evaluation of both the strengths and limitations of the primary data collection methods used.
- Explicitly links the effectiveness of the methods to the overall validity and reliability of the data and final conclusions.
- Reaches a clear, well-supported concluding judgment.

Overcultivation is a major human-induced cause of desertification. When land is continuously cropped without sufficient fallow periods, the soil is depleted of nutrients, loses its structure, and becomes highly vulnerable to wind and water erosion. Options B and D represent natural factors, while option C is a soil conservation technique designed to prevent degradation.

Award 1 mark for the correct answer (a). Award 0 marks for any other response.

GNI per capita is a simple arithmetic mean (total national income divided by population). Consequently, it does not reveal how wealth is distributed and can mask extreme economic inequalities within a country. Option A is incorrect because GNI per capita does account for population size. Option B is incorrect as GNI is a single economic indicator rather than a composite index. Option D is incorrect because GNI is an economic measure, not a social one.

Award 1 mark for the correct answer (c). Award 0 marks for any other response.

Overgrazing occurs when too many livestock graze on an area of land, which removes the protective vegetation cover and leaves the soil vulnerable to erosion by wind and rain, leading to desertification.

Award 1 mark for any valid human cause of desertification. Acceptable answers include: overgrazing, over-cultivation, deforestation, population growth (leading to increased demand for fuel wood), or unsustainable irrigation practices. Reject natural causes such as drought or climate change.

Foreign direct investment (FDI) refers to the injection of capital by a company, typically a Transnational Corporation (TNC), into the economic operations or infrastructure of another country.

Award 1 mark for a clear definition that mentions investment/capital flow from one country/company into another country. Accept: a company setting up factories or offices in another country. Reject: general definitions of investment that do not indicate a cross-border or international element.

A social indicator measures the quality of life and social well-being of a population. Examples include life expectancy, adult literacy rate, or infant mortality rate.

Award 1 mark for any valid social indicator of development. Acceptable answers include: life expectancy, literacy rate, infant mortality rate, people per doctor, or school enrolment rate. Reject economic indicators such as GDP per capita, GNI per capita, or employment structure.

One reason is the level of economic development or wealth of a country. Poorer countries often lack the financial resources to implement large-scale soil management strategies, such as building terraces, planting windbreaks, or investing in efficient irrigation systems. Consequently, they cannot mitigate the effects of drought, making their agricultural land far more vulnerable to turning into desert compared to wealthier nations.

Award 1 mark for identifying a valid reason (e.g., poverty, reliance on agriculture, climate severity) and a second mark for expansion/explanation of how this increases vulnerability. Example: Poverty or lack of national wealth (1) means the country cannot afford modern irrigation systems or afforestation schemes to protect fragile soils (1).

TNCs in developing countries tend to cause more direct, local environmental damage, such as industrial water pollution, air pollution, or deforestation, because environmental regulations are often weaker or poorly enforced to attract foreign investment. In contrast, in developed countries, TNCs face much stricter environmental laws and public scrutiny, leading to cleaner operations, though their offices and supply chains still contribute to global greenhouse gas emissions.

Award 1 mark for a point of comparison about developed countries and 1 mark for a contrasting point about developing countries (or 2 marks for a fully developed comparative point). Example: In developing countries, TNCs often cause higher levels of local pollution or deforestation due to weak environmental laws (1), whereas in developed countries, stricter regulations force TNCs to use cleaner technologies or face heavy fines (1).

GNI per capita is a mean average of total national income divided by the population. It does not show how wealth is actually distributed across the population. Therefore, a country can have a high GNI per capita due to a small, extremely wealthy elite (for example, from resource extraction like oil), while the vast majority of the population suffers from poor living conditions, low literacy rates, and lack of healthcare access.

Award 1 mark for identifying a limitation of GNI per capita (e.g., it is a mean average, ignores social aspects, ignores the informal economy) and a second mark for explaining why this misrepresents development. Example: It is an average value (1) which can hide extreme wealth inequalities within the country's population (1).

The natural greenhouse effect is a natural process essential for life, where greenhouse gases in the atmosphere trap just enough of the sun's heat to keep Earth habitable. In contrast, the enhanced greenhouse effect is caused by human activities (such as burning fossil fuels and deforestation) which increase the concentration of these gases, trapping too much heat and causing global temperatures to rise.

Award 1 mark for a characteristic of the natural greenhouse effect (e.g., natural, keeps Earth warm/habitable) and 1 mark for a contrasting characteristic of the enhanced greenhouse effect (e.g., human-induced, leads to global warming/excess heat). Example: The natural greenhouse effect is a natural process that maintains life-supporting temperatures on Earth (1), while the enhanced greenhouse effect is caused by human activities increasing greenhouse gases and causing global warming (1).

One human cause of desertification is overgrazing. This occurs when farmers keep too many farm animals on a limited area of pasture, causing the vegetation to be eaten faster than it can regenerate, which leaves the topsoil bare and exposed to wind and water erosion. A second human cause is over-cultivation. This happens when crops are grown continuously on the same land without fallow periods, exhausting the soil's nutrients and organic matter, which breaks down its structure and causes it to dry out into dust.

Award 1 mark for each identified human cause, plus 1 mark for its development/explanation, up to a maximum of 4 marks (2 x 2 marks).
- Overgrazing (1) which strips vegetation cover and leaves soil vulnerable to erosion (1).
- Over-cultivation (1) which depletes soil nutrients and breaks down soil structure, making it turn to dust (1).
- Deforestation / clearing trees for fuelwood (1) which removes root networks that bind the soil together, leading to increased soil erosion (1).
- Inefficient irrigation practices (1) which can lead to salinisation, making the soil too toxic and dry for plant growth (1).

Local community schemes are often highly effective because they utilize appropriate, low-cost technology that is easily managed by local populations. For example, in the Sahel, communities have used 'magic stones' (contour stone bunds) to trap water and soil, reducing runoff and soil erosion while increasing crop yields. Another successful local initiative is community agroforestry, where planting trees like acacia provides shade, restores soil nutrients, and acts as a barrier against wind erosion. These schemes have high success rates because they foster local ownership and do not rely on expensive imports. However, their primary limitation is scale. Local community projects are often small and fragmented, unable to combat desertification on a regional or global level without coordinated national policies and international funding. Additionally, they cannot prevent the broader climate change impacts driving desertification. Therefore, while highly effective on a micro-level, they must be integrated into broader national and global frameworks to be fully successful.

Level 1 (1-2 marks): Demonstrates isolated elements of geographical knowledge. Response is descriptive and lacks structured assessment of effectiveness. Level 2 (3-4 marks): Demonstrates geographical knowledge applied to the context. An assessment is attempted with some balance between strengths and limitations, but lacks detailed examples or depth. Level 3 (5-6 marks): Demonstrates detailed geographical knowledge and understanding of specific local schemes (such as magic stones or agroforestry). Fully applies this to construct a well-balanced assessment of their effectiveness, culminating in a clear, logical conclusion.

In your answer, you should structure your response with a clear introduction, comparative paragraphs analyzing different scales of management, and a justified conclusion. 1. Introduction: Define fragile environments (such as coral reefs, tropical rainforests, or desert margins) and outline the key scales of management (international, national, and local). 2. International Agreements: Discuss agreements like the Paris Agreement, CITES, or the Kyoto Protocol. Explain that these are essential for addressing global transboundary issues like greenhouse gas emissions. However, highlight their limitations, such as a lack of binding enforcement mechanisms, susceptibility to political changes, and slow implementation. 3. National Strategies: Explore national policies, such as the establishment of National Parks or marine reserves (e.g. Great Barrier Reef Marine Park), or national afforestation schemes (e.g. China's Green Wall). These are powerful because they are legally enforceable and can mobilize significant national funding, but they may face resistance from local communities if top-down or fail due to corruption and lack of monitoring. 4. Local Strategies: Evaluate bottom-up approaches, such as community-managed forests, agroforestry, or local ecotourism schemes. These have high local compliance and are tailored to specific cultural and ecological contexts. However, they cannot address global threats like rising sea levels on their own. 5. Conclusion: Conclude by evaluating 'to what extent' international agreements are more effective. A strong conclusion will argue that while international agreements provide the necessary global framework and targets, they are ineffective without national legislation to enforce them and local action to implement them on the ground. A holistic, multi-scale approach is therefore the most effective.

Marking is based on a 4-level assessment grid. Level 1 (1-3 marks): Demonstrates isolated elements of geographical knowledge. Descriptive, lacks a clear argument or structure. Little or no evaluation of the different scales of management. Level 2 (4-6 marks): Demonstrates some geographical knowledge and understanding of different management scales (e.g. mentions international and local examples). Some structure to the argument, but may be unbalanced or lack depth in evaluation. Level 3 (7-9 marks): Demonstrates detailed geographical knowledge and understanding. Explains both international, national, and local strategies with appropriate examples (e.g. Paris Agreement, National Parks, community initiatives). Shows a clear, balanced argument comparing their effectiveness. Level 4 (10-12 marks): Demonstrates precise and comprehensive geographical knowledge and understanding. Evaluates the scales of management critically, showing how they interact. Offers a well-developed, logical argument leading to a substantiated and balanced conclusion.