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(a)(i) Natural population increase is the difference between the birth rate and the death rate, where the birth rate is higher than the death rate, excluding the effects of migration. (a)(ii) 1. Improvements in healthcare services, such as vaccinations, hospitals, and access to medicine. 2. Better access to clean water, reliable food supplies, and improved public sanitation. (a)(iii) Economic development leads to urbanisation, where children are no longer needed as economic assets for agricultural labor. It also raises the cost of living and raising children, while increasing female access to education and career opportunities, which often delays marriage and childbirth. (a)(iv) Underpopulation occurs when there are too few people to fully utilise the available resources in an area. Causes include long-term low fertility rates (often below replacement level), high rates of emigration of the working-age population (brain drain), highly developed societies with strong career focuses, and excellent family planning access. (b)(i) Overpopulation leads to high pressure on resources, causing problems such as: 1. Shortages of food and water, leading to malnutrition. 2. Severe overcrowding and the growth of informal settlements or slums. 3. Overburdened public services, including schools, clinics, and hospitals. (b)(ii) Strategies include: 1. Implementing anti-natalist policies (such as family size limits or tax penalties for large families). 2. Increasing access to free or subsidised family planning education and contraception. 3. Promoting secondary and tertiary education for girls, which naturally delays marriage and childbearing. 4. Using public media campaigns to advocate the benefits of smaller families. 5. Raising the legal age of marriage. (c) Case Study: Niger. Niger has one of the world's highest rates of natural population growth. The causes include: 1. Deeply embedded cultural and religious traditions where large families are a symbol of wealth and social status. 2. A high infant mortality rate, which encourages families to have more children to ensure that some survive to adulthood. 3. A heavy reliance on subsistence agriculture, where children are highly valued as source of farm labour. 4. Extremely low rates of female literacy and limited secondary school enrollment for girls, leading to early marriages (often before age 18) and a long reproductive window. 5. Very low usage and lack of access to modern family planning methods.

(a)(i) 1 mark for defining natural population increase as birth rate minus death rate, excluding migration. (a)(ii) 1 mark per valid factor identified (e.g., improved healthcare, clean water, vaccination, improved diet). Max 2. (a)(iii) 1 mark per valid explanation point linking development to lower births (e.g., increased cost of children [1], women working/educated [1], shift from primary to secondary/tertiary sectors meaning children are not needed for agricultural work [1]). Max 3. (a)(iv) 1 mark per valid explanation of why countries are underpopulated (e.g., birth rates below replacement level [1], young professionals migrating away [1], high career focus delaying marriage [1], government policies promoting small families [1]). Max 4. (b)(i) 1 mark per valid description of problems (e.g., water shortage, lack of housing/slums, traffic congestion, high unemployment, strain on clinics). Max 3. (b)(ii) 1 mark per explained strategy (up to 5 marks). Max 3 marks if strategies are only listed without explanation (e.g., family planning promotion [1] + explanation of how it reduces unwanted pregnancies [1]; education of girls [1] + explanation that it delays marriage/first child [1]). Max 5. (c) Level 1 (1-3 marks): Identifies causes of high natural population growth (e.g., need children for farms, early marriage, lack of contraception) but without specific detail or case study reference. Level 2 (4-6 marks): Explains causes of high growth with specific reference to the named country (e.g., in Niger, early marriage is common with 75% of girls married before 18; children are crucial for subsistence millet farming). Level 3 (7 marks): Detailed, comprehensive explanation with specific named/located details and statistics for a valid chosen country.

(a)(i) A drainage basin is the area of land drained by a river and all of its tributaries. (a)(ii) Any two of: Hydraulic action, Abrasion (Corrasion), Attrition, Solution (Corrosion). (a)(iii) Traction occurs when large, heavy rocks and boulders are rolled along the river bed by the sheer force of the water flow. Saltation occurs when medium-sized pebbles and small stones are bounced or leaped along the river bed in a hopping motion. (a)(iv) Deposition occurs when a river loses energy and velocity. This happens when: 1. The volume of water decreases (e.g., during dry seasons). 2. The gradient of the river bed flattens out (e.g., as it enters the lower course, sea, or lake). 3. The river encounters an obstacle or flow slows on the inner bend of a meander. 4. The river flows into a standing body of water like a lake or ocean. (b)(i) Features of a waterfall include: A hard rock layer overlying a soft rock layer; a steep drop or vertical cliff; a plunge pool at the base of the falls; an overhanging ledge of hard rock; and a steep-sided gorge downstream formed by the headward retreat of the waterfall. (b)(ii) Meanders develop because water flows faster on the outer bend, causing lateral erosion (via abrasion and hydraulic action), and slower on the inner bend, causing deposition. Over time, this erosion and deposition narrow the neck of the meander loop. During a high-flow event or flood, the river takes the shortest, straightest path and cuts directly through the narrow neck. Deposition eventually seals off the old meander loop, leaving a crescent-shaped oxbow lake cut off from the main channel. (c) Case Study: River Ganges (Bangladesh). Causes of flooding: 1. Heavy, concentrated monsoon rains during the summer. 2. Rapid snowmelt from the Himalayan mountains in spring. 3. High tides in the Bay of Bengal preventing river water from draining efficiently. 4. Severe deforestation upstream in Nepal, reducing interception and increasing rapid surface runoff. Effects of flooding: 1. Loss of lives and displacement of millions of rural residents. 2. Destruction of crops (such as rice fields) leading to severe food shortages. 3. Contamination of drinking water wells, resulting in waterborne diseases like cholera. 4. Damage to infrastructure (roads, bridges, schools) disrupting the economy.

(a)(i) 1 mark for correct definition of drainage basin. (a)(ii) 1 mark per correct erosion process (e.g., abrasion, hydraulic action). Max 2. (a)(iii) 1 mark for traction definition (rolling of large stones/boulders) [1]; 1 mark for saltation definition (bouncing/hopping of pebbles) [1]; 1 mark for clear distinction/link to flow velocity/force [1]. Max 3. (a)(iv) 1 mark per valid condition with explanation (e.g., reduction in river gradient [1], decrease in water volume [1], increase in friction/inner bend [1], river entering a lake/sea [1]). Max 4. (b)(i) 1 mark per described feature (e.g., plunge pool, hard/soft rock layers, overhang, gorge, steep drop). Max 3. (b)(ii) 1 mark for identifying faster flow on outer bend causing erosion [1]; 1 mark for slower flow on inner bend causing deposition [1]; 1 mark for narrowing of the meander neck [1]; 1 mark for the river cutting through during high flow/flood [1]; 1 mark for deposition blocking the old channel to form an oxbow lake [1]. Max 5. (c) Level 1 (1-3 marks): Identifies simple causes or effects of flooding (e.g., heavy rain, people die, houses destroyed) without specific detail or named case study. Level 2 (4-6 marks): Explains both causes and effects of flooding with reference to a named river basin (e.g., River Ganges in Bangladesh, mentioning Himalayan snowmelt, monsoon rains, silt deposition, and cholera outbreaks). Level 3 (7 marks): Detailed, comprehensive explanation of both causes and effects with specific geographic facts, figures, or locations along the chosen river basin.

(a)(i) Eco-tourism is environmentally friendly tourism that minimises negative impacts on the environment and benefits local conservation efforts and local people. (a)(ii) Any two of: Sandy beaches, coral reefs, mountains, natural hot springs, national parks/wildlife. (a)(iii) Tourism increases demand for local goods and services. Local businesses benefit directly from tourist spending on accommodation, restaurants, and souvenirs. This creates a multiplier effect, as these businesses then buy supplies from local farmers or wholesalers, boosting the local economy. (a)(iv) Seasonal tourism means high demand is concentrated in a few months (e.g., summer or ski season). Economic challenges include: 1. Seasonal unemployment, where workers are laid off during the off-season. 2. Fluctuating cash flow, making it hard for businesses to survive the quiet months. 3. Underutilised infrastructure (hotels, transport) during the off-season. 4. Overcrowding and inflation of prices for locals during peak season. (b)(i) Negative coastal impacts include: 1. Destruction of coral reefs due to tourist boats anchoring, snorkeling, and diving. 2. Water pollution from untreated sewage discharged by hotels into the sea. 3. Destruction of sand dunes and coastal habitats to build hotels, leading to increased coastal erosion. (b)(ii) Management strategies include: 1. Restricting visitor numbers (using quotas or permits) to prevent overcrowding and environmental degradation. 2. Enforcing strict environmental regulations on hotels regarding waste management and construction locations. 3. Promoting eco-tourism initiatives that educate tourists and involve local guides. 4. Charging entry fees to national parks/beaches to fund conservation work. 5. Diversifying the tourist attractions (e.g., cultural tours) to spread visitors throughout the year and reduce pressure on specific spots. (c) Case study: Majorca (Spain). Advantages to local people: 1. Job creation in hotels, restaurants, and transport sectors, raising household incomes. 2. Improved infrastructure, such as upgraded roads, modern hospitals, and a larger airport, which benefits local residents as well as tourists. 3. Preservation of local cultural heritage, such as traditional festivals and historical sites, funded by tourism revenue. Disadvantages to local people: 1. Severe seasonal inflation, making housing and basic goods unaffordable for local young people. 2. Loss of access to public beaches and natural spaces due to overcrowding during peak summer months. 3. Cultural conflict and noise pollution, particularly from nightlife areas like Magaluf, disrupting quiet residential areas. 4. Water shortages as golf courses and hotels consume large volumes of water, competing with local agricultural and domestic needs.

(a)(i) 1 mark for correct definition (responsible/sustainable travel to natural areas that conserves the environment and improves the well-being of local people). (a)(ii) 1 mark per valid physical attraction identified (e.g., white sand beaches, volcanic peaks, waterfalls, coral reefs). Max 2. (a)(iii) 1 mark per explained benefit (e.g., tourists spend money directly in restaurants/shops [1]; multiplier effect where local farmers sell to hotels [1]; investment in local startups catering to tours [1]). Max 3. (a)(iv) 1 mark per explained economic challenge (e.g., seasonal unemployment where staff are laid off [1]; difficulty securing loans due to unstable seasonal income [1]; high maintenance costs of empty hotels in winter [1]; inflation of local prices during peak seasons [1]). Max 4. (b)(i) 1 mark per described environmental impact (e.g., litter on beaches, trampling of sand dunes, sewage spills killing marine life, noise disturbing nesting sea birds). Max 3. (b)(ii) 1 mark per explained management strategy (up to 5 marks). Max 3 marks if strategies are only listed without explanation (e.g., setting seasonal quotas [1] to prevent carrying capacity from being exceeded [1]; zoning coastal areas [1] to keep speedboats away from fragile coral reefs [1]; heavy fines for hotel waste dumping [1]). Max 5. (c) Level 1 (1-3 marks): Identifies general advantages and/or disadvantages of tourism (e.g., brings jobs, causes noise, pollution, expensive food) without specific location detail. Level 2 (4-6 marks): Explains both advantages and disadvantages for a named tourist area (e.g., Majorca, showing how jobs in tourism support families but high water use by golf courses/hotels depletes the local aquifers and Magaluf nightlife disrupts local neighborhoods). Level 3 (7 marks): Comprehensive, balanced explanation of both advantages and disadvantages with precise, named/located details and/or statistics for the selected tourist area.

Part a: (i) Looking at grid square 3478, the green tint with tree symbols indicates deciduous woodland. (ii) Locate PO in square 3681. It lies 4 tenths east (364) and 1 tenth north (812), giving 364812. (iii) The blue triangle representing the triangulation station has the number 247 next to it, which is the height in metres. (iv) The symbol at 352794 shows a secondary road crossing a blue river line, which indicates a road bridge. Part b: (i) Measuring with a ruler gives approximately 8.8 cm. At 1:50,000 scale, 1 cm represents 0.5 km. Thus, 8.8 cm * 0.5 km/cm = 4.4 km. (ii) Drawing a line from 352794 to 391815 goes towards the upper-right, which is North-East. Measuring with a protractor from grid North gives a bearing of 62 degrees. Part c: The coastline in grid squares 3282 to 4082 exhibits tightly spaced contour lines indicating cliffs, yellow dotted shading indicating a sandy beach, projecting headlands separated by recessed bays, and rocky shoreline ornament. Part d: Lowland valley squares (3278-3478) show clustered black squares (nucleated settlements) and pink urban shading, alongside a pink primary road and a railway line. In contrast, the south-east upland squares (3875-4075) have closely packed brown contour lines (steep terrain), only isolated black squares (dispersed/sparse settlement), and minor footpaths/tracks rather than main roads or rail. Part e: In squares 3881 and 3981, we find the tent symbol (campsite), the picnic table symbol (picnic site), and the 'Info' label (Tourist Information Centre).

Total: 20 marks. Part a [4 marks]: (i) Award 1 mark for identifying woodland/forest (accept deciduous woodland, trees). (ii) Award 1 mark for correct 6-figure grid reference 364812 (accept 363812 to 365812). (iii) Award 1 mark for 247m (accept 247). (iv) Award 1 mark for road bridge / bridge. Part b [4 marks]: (i) Award 1 mark for correct map measurement / scale conversion method (e.g., multiplying cm by 0.5). Award 1 mark for accurate distance 4.4 km (accept 4.2 to 4.6 km). (ii) Award 1 mark for compass direction North-East (NE) or East-North-East (ENE). Award 1 mark for bearing of 62 degrees (accept 60 to 64 degrees). Part c [4 marks]: Award 1 mark per valid descriptive point of coastal physical features up to 4 marks. Points include: Cliffs / steep slopes (1), sandy beach / spit / beach (1), headlands (1), bays (1), rock platforms / rocky coast (1), river mouth / estuary (1). Part d [5 marks]: Award up to 5 marks for comparative points between the lowland valley and upland area (must mention both areas or use comparative language for full marks). Points include: Valley has dense/nucleated settlement whereas upland is sparse/dispersed (1); Valley has a major primary A-road whereas upland has only tracks/footpaths (1); Valley contains a railway line whereas upland has no railway (1); Valley is flat/low-lying whereas upland is steep/high (1); Valley has many buildings whereas upland has very few/isolated buildings (1). Part e [3 marks]: Award 1 mark for each correct tourist/recreation facility identified up to a maximum of 3 marks. Features include: Campsite / camping ground (1), picnic site / picnic area (1), Tourist Information Centre (1), viewpoint / lookout (1).

For (a)(i), read directly from Table 1.1: Basin B Peak Discharge = 55 m³/s. For (a)(ii), subtract Basin B's lag time from Basin A's: 6.0 hours - 1.5 hours = 4.5 hours. For (b), compare each parameter: Peak discharge is higher in Basin B; lag time is shorter in Basin B; flood duration is shorter in Basin B. For (c), explain that urban surfaces are impermeable, leading to less infiltration and more rapid surface runoff, whilst storm drains accelerate the flow of water into the river.

(a)(i) 55 m³/s (1 mark). (a)(ii) 4.5 hours (1 mark) - accept 4 hours 30 minutes. (b) Award 1 mark for each valid compared difference with correct units: Basin B has a higher peak discharge than Basin A / 55 m³/s compared to 15 m³/s (1 mark); Basin B has a shorter lag time than Basin A / 1.5 hours compared to 6.0 hours (1 mark); Basin B has a shorter total flood duration than Basin A / 12 hours compared to 24 hours (1 mark). (c) Award 1 mark for each valid explanation: Impermeable surfaces/concrete/tarmac prevent infiltration (1 mark); increased surface runoff/overland flow (1 mark); artificial drains/gutters/sewers channel water quickly to the river (1 mark).

For (a)(i), identify Earthquake Y as having the deepest focus of 95 km. For (a)(ii), identify Earthquake X as having the highest deaths (15,000), and state its magnitude: 7.2. For (b), explain the difference in vulnerability between LICs (poor infrastructure, weak building codes, lack of emergency response, high density housing) and HICs (earthquake-resistant engineering, high preparedness, effective warning systems). For (c), explain that shallow earthquakes (closer to the surface) experience less attenuation of seismic energy, resulting in stronger surface shaking and higher destructive power compared to deep-focus earthquakes where energy is absorbed by the crust over a longer travel distance.

(a)(i) Earthquake Y (1 mark). (a)(ii) 7.2 (1 mark). (b) Award up to 3 marks for comparative points on socio-economic factors: HICs (Z) have earthquake-resistant building codes/designs (e.g. shock absorbers, steel frames) whereas LICs (X) have poorly constructed buildings/mud/brick housing that collapses easily (1 mark); HICs have better disaster preparation/drills/education (1 mark); HICs have superior emergency services/rescue equipment/medical facilities (1 mark); LICs have higher population densities in vulnerable urban areas (1 mark). (c) Award up to 3 marks for physical explanation: Seismic waves have a shorter distance to travel to the surface in shallow earthquakes (1 mark); less energy is lost/attenuated through the rocks (1 mark); this results in greater ground shaking/vibration at the surface (1 mark); deep focus earthquakes lose more energy before reaching the surface (1 mark).

For (a)(i), use the formula: \(\text{Percentage Increase} = \frac{\text{New Value} - \text{Old Value}}{\text{Old Value}} \times 100\). Calculation: \(\frac{2.4 - 1.2}{1.2} \times 100 = 1.0 \times 100 = 100\%\). One mark for correct working, one mark for correct answer. For (a)(ii), divide receipts by arrivals: \(\frac{\$900,000,000}{1,200,000} = \$750\) per tourist. For (b), note that both arrivals and receipts increase every year (arrivals increase from 1.2M to 2.4M, receipts from $900M to $1600M). For (c), identify consequences of tourist pressure on the island: loss of biodiversity, coastal degradation, litter/solid waste disposal issues, and carbon emissions.

(a)(i) Award 1 mark for correct working: \(((2.4 - 1.2) / 1.2) \times 100\) (or equivalent) (1 mark); 100% (1 mark). (a)(ii) $750 (1 mark). (b) Award up to 2 marks for description: Both arrivals and receipts increase over the 5 years (1 mark); arrivals doubled / increased by 1.2 million (1 mark); receipts increased by $700 million / did not double / grew at a slightly slower rate after Year 3 (1 mark). (c) Award up to 3 marks for distinct environmental impacts: Loss of ecosystems/habitats due to clearing land for hotels/resorts (1 mark); water pollution from cruise ships/sewage discharge (1 mark); litter/waste management issues on beaches (1 mark); depletion of local water resources/freshwater scarcity (1 mark); damage to coral reefs from scuba diving/boat anchors (1 mark).

For (a)(i), calculate rate of natural increase: \(\text{Birth Rate} - \text{Death Rate} = 42 - 14 = 28\). Convert rate per 1000 to a percentage by dividing by 10: \(28 / 10 = 2.8\%\). One mark for correct subtraction/working, one mark for correct percentage. For (a)(ii), Country Q has DR (11) > BR (10), resulting in natural decrease. For (b), link high infant mortality to development factors: poor maternal care, malnutrition, lack of sanitation, spread of infectious diseases. For (c), Country Q's low birth rate and high life expectancy indicate an ageing population, which causes a high dependency ratio, strain on healthcare services, and labor shortages.

(a)(i) Award 1 mark for correct subtraction: \(42 - 14 = 28\) per 1000 (1 mark); Award 1 mark for converting to percentage: 2.8% (1 mark). (a)(ii) Country Q (1 mark); explanation: Death rate is higher than birth rate / negative natural increase of -0.1% (1 mark). (b) Award up to 2 marks for reasons: Lack of clean drinking water/sanitation leading to waterborne diseases (1 mark); poor maternal healthcare/lack of trained doctors/hospitals (1 mark); lack of immunization/vaccinations against childhood diseases (1 mark); food insecurity/malnutrition among mothers and infants (1 mark). (c) Award up to 2 marks for challenges: Ageing population/high dependency ratio (1 mark); increased tax burden on working population to fund pensions/healthcare (1 mark); shortage of domestic labour/need to import workers (1 mark); closure of schools/maternity wards due to low birth rates (1 mark).

For (a)(i), identify Country D with the lowest HDI (0.395). For (a)(ii), observe that higher GNI per capita corresponds to higher literacy rates (e.g., Country A: $48,000 and 99% vs Country D: $850 and 45%), describing this as a strong positive relationship/correlation. For (b), explain that HDI includes life expectancy (health) and schooling years (education) alongside GNI per capita (income). Economic growth alone does not guarantee progress in human welfare or equal access to resources. For (c), national averages conceal internal inequalities (regional disparities, gender inequality, and income distribution differences).

(a)(i) Country D (1 mark). (a)(ii) Award up to 2 marks: There is a positive correlation/relationship (1 mark); as GNI per capita increases, adult literacy rate increases (1 mark); use of comparative data to illustrate (e.g. Country A has $48,000 and 99% compared to Country D with $850 and 45%) (1 mark). (b) Award up to 3 marks for explanation: HDI is a composite index/combines economic and social indicators (1 mark); it measures health (life expectancy) and education (years of schooling) as well as income (GNI per capita) (1 mark); single economic indicators do not show how wealth is invested in public services (1 mark); wealth can be concentrated in a few hands while most remain poor/uneducated (1 mark). (c) Award up to 2 marks for limitations: National averages hide regional inequalities/differences between rural and urban areas (1 mark); they hide gender inequalities (1 mark); they hide extreme wealth disparities/gap between rich and poor (1 mark).

Part (a): Use a map of Oakhaven to draw a straight line (transect) starting from the main entrance of Oakhaven Castle. Use a measuring tape or a digital mapping tool to mark sampling sites at strict, regular intervals of every 100 meters (50m, 150m, 250m, 350m, and 450m). Conduct the EQS exactly at these predetermined points. Part (b): Systematic sampling ensures an even geographical coverage along the entire length of the transect. It prevents clustering of sample points which could occur with random sampling, and clearly demonstrates the relationship between distance and environmental quality without bias. Part (c): Total Score = \((-1) + 0 + (-2) + 2 + 1 = 0\). Part (d): 1. Draw a horizontal axis (x-axis) for the independent variable: 'Distance from Castle (meters)' ranging from 0 to 500m. 2. Draw a vertical axis (y-axis) through the center or left for the dependent variable: 'Total EQS Score' ranging from -5 to +5. 3. Plot the five coordinate pairs accurately: (50, -4), (150, -1), (250, 0), (350, +3), and (450, +5). 4. Draw a positive straight line of best fit showing the upward trend. Part (e): Accept Hypothesis 1. The data clearly shows that environmental quality decreases closer to the castle. At 50m away (closest), the EQS score is at its lowest (-4). As distance increases to 150m, the score improves to -1. At 250m it reaches 0, at 350m it rises to +3, and at 450m (furthest) it reaches the highest environmental quality score of +5. Part (f): Question 1: 'Does traffic congestion caused by tourism affect your journey times? (Yes/No)'. Question 2: 'On a scale of 1 to 5, how much does litter from visitors affect your local area?'. Part (g): Residents live in Oakhaven permanently and experience the daily negative side-effects of tourism (such as noise, litter, crowded pavements, and traffic congestion) during their commute and routine life without necessarily benefiting from the leisure aspects. Tourists are short-term visitors who experience polished, well-maintained visitor areas, are focused on leisure, and have positive bias as they do not witness long-term environmental degradation. Part (h): 1. Increase sample size by surveying more people (e.g., 100 residents and 100 tourists instead of 50). 2. Repeat the environmental quality surveys at different times of the day (morning, afternoon, evening) or on different days of the week (weekend vs. weekday) to get a more representative average. 3. Use digital measurement tools (like decibel meters to measure noise levels) rather than relying solely on subjective human observation scores.

Part (a) [3 marks]: 1 mark for establishing a transect line/direction from the castle. 1 mark for specifying a regular interval (e.g., 100m). 1 mark for describing the measurement process. Part (b) [2 marks]: 1 mark for mentioning even/full coverage of the area. 1 mark for explaining how it avoids bias/clustering compared to random sampling. Part (c) [3 marks]: 1 mark for setting up the calculation correctly with signs. 1 mark for the correct step-by-step arithmetic. 1 mark for the correct final answer of 0. Part (d) [4 marks]: 1 mark for correct labeling of the x-axis (Distance) and y-axis (EQS score). 1 mark for appropriate scaling of both axes. 1 mark for accurate plotting of all 5 data points. 1 mark for drawing a correct line of best fit. Part (e) [5 marks]: 1 mark for explicit hypothesis statement (Accept/True). 4 marks for utilizing comparative data points linking distance to score (must cite at least three specific distances and their corresponding scores to show the pattern). Part (f) [2 marks]: 1 mark for each valid closed-ended question directly related to negative tourist impacts. Part (g) [5 marks]: Max 3 marks for resident perspective (daily exposure, traffic, congestion, lack of benefit). Max 3 marks for tourist perspective (temporary stay, focus on clean areas, positive bias). Part (h) [6 marks]: 2 marks for each of the three distinct, well-explained improvements (e.g., sample size, timing variations, objective instruments/averaging to reduce subjective bias).

(a) The three hazards and precautions are:
1. Fast-flowing/deep water: Precaution is to avoid entering water deeper than knee level / wear a life jacket.
2. Slippery/uneven riverbed: Precaution is to wear sturdy waders or boots with good grip / walk slowly and use a pole for stability.
3. Water-borne diseases (e.g., Leptospirosis/Weil's disease): Precaution is to cover cuts with waterproof plasters / wash hands before eating.

(b) Method to measure channel width:
- Stretch a tape measure tightly across the river channel from one wet bank to the other.
- Ensure the tape is kept horizontal and held at 90 degrees (perpendicular) to the banks.
Method to measure channel depth:
- Use a graduated meter rule.
- Take measurements at systematic, regular intervals across the width of the river (e.g., every 50 cm).
- Ensure the narrow edge of the ruler faces the current to reduce water buildup.
- Ensure the ruler touches the riverbed gently without sinking into soft silt.

(c)(i) Calculations:
- Site 2 Cross-sectional area = \(3.5\text{ m} \times 0.40\text{ m} = 1.40\text{ m}^2\)
- Site 3 Cross-sectional area = \(8.2\text{ m} \times 0.75\text{ m} = 6.15\text{ m}^2\)
(c)(ii) A pilot study helps to test equipment, practice techniques, identify safety risks, and determine appropriate intervals for depth measurements before conducting the official fieldwork.

(d) Conclusion:
- Hypothesis 1 is supported/correct.
- The cross-sectional area increases from Site 1 downstream to Site 3.
- Supporting data: At Site 1, the cross-sectional area is \(0.18\text{ m}^2\) (calculated as \(1.2\text{ m} \times 0.15\text{ m}\)), which increases to \(1.40\text{ m}^2\) at Site 2, and further increases to \(6.15\text{ m}^2\) at Site 3.

(e) Velocity method using a float:
1. Use a tape measure to measure out a 10-metre stretch along the riverbank.
2. Mark the start and end of the 10-metre section with ranging poles.
3. Place a float (e.g., an orange peel or plastic float) slightly upstream of the start line to allow it to accelerate to flow speed.
4. Start the stopwatch as the float passes the start line and stop it as it passes the finish line.
5. Repeat the measurement across different points of the channel width (e.g., left, centre, right) to get an average flow speed, then calculate: Velocity = Distance (10m) / Average Time.

(f) Why a digital flowmeter is more accurate:
- It measures velocity below the surface (at 0.6 of the depth), avoiding the friction effects of air/wind and surface tension.
- It is not affected by wind speed or direction, unlike a surface float.
- It provides a digital reading, reducing human reaction time errors in starting/stopping a stopwatch.
- It does not get snagged or stuck in rocks, vegetation, or eddies like a float does.

(g) Improvements:
- Select more sample sites along the river profile (e.g., 5-10 sites) to identify patterns more clearly.
- Carry out measurements at different times of the year/seasons to account for varying weather and river levels.
- Take depth readings at smaller, more frequent intervals (e.g., every 10 or 20 cm instead of 50 cm) for a more precise cross-sectional area.
- Have multiple student groups repeat the measurements at each site and compute an average to minimize user error.

(h) Human activities:
- Urbanization upstream introduces impermeable surfaces (concrete), increasing overland runoff, which rapidly increases peak discharge and flow velocity.
- Dam/reservoir construction upstream regulates river flow, holding back water and lowering both downstream discharge and velocity.
- Channelization (lining with concrete/straightening) reduces friction, which significantly increases flow velocity downstream.

(a) [3 marks total - 1 mark for each hazard paired with a valid, specific precaution]
- Acceptable hazards: Fast/deep water, slippery rocks, waterborne infections/diseases, cold weather/hypothermia, steep banks.
- Reject: General statements like 'getting lost' or 'getting hurt' without geographical context.

(b) [5 marks total - Max 3 marks for width measurement, Max 3 marks for depth measurement]
- 1 mark: Stretch tape measure taut across the channel.
- 1 mark: Measure from wet bank to wet bank / water level to water level.
- 1 mark: Keep tape perpendicular to flow / 90 degrees.
- 1 mark: Use a graduated meter rule / graduated dip pole.
- 1 mark: Take measurements at systematic/equal intervals across the riverbed.
- 1 mark: Keep flat edge of rule parallel to current / narrow edge facing flow.
- 1 mark: Touch the bed gently without pushing into mud.

(c)(i) [2 marks total]
- 1 mark: Correct calculation for Site 2 = \(1.40\text{ m}^2\) (must include unit \(\text{m}^2\))
- 1 mark: Correct calculation for Site 3 = \(6.15\text{ m}^2\) (must include unit \(\text{m}^2\))
(c)(ii) [1 mark total]
- 1 mark: Ideas such as: tests/checks equipment; practice fieldwork methods; identify local hazards; determines the best interval spacing.

(d) [4 marks total]
- 1 mark: State clearly that the hypothesis is supported / correct.
- 1 mark: Describe the trend (cross-sectional area increases downstream / from Site 1 to Site 3).
- 2 marks: Comparative data support (must reference calculated areas for all 3 sites with units: Site 1 = \(0.18\text{ m}^2\), Site 2 = \(1.40\text{ m}^2\), Site 3 = \(6.15\text{ m}^2\)). Deduct 1 mark if units are omitted.

(e) [5 marks total]
- 1 mark: Measure 10m distance along the river bank with a tape measure.
- 1 mark: Put ranging poles at start and end lines.
- 1 mark: Release float upstream of the start line.
- 1 mark: Use a stopwatch to time the float from start to finish line.
- 1 mark: Repeat across different parts of the channel width (left, center, right).
- 1 mark: Calculate velocity using formula: \(\text{Velocity} = \text{Distance} / \text{Time}\).

(f) [3 marks total - 1 mark per valid point]
- 1 mark: Measures velocity below the surface (where flow is representative / unaffected by wind).
- 1 mark: Eliminates surface friction/wind interference.
- 1 mark: Eliminates human stopwatch timing errors / reaction time errors.
- 1 mark: Float can get stuck in weeds/debris; flowmeter does not.

(g) [4 marks total - 1 mark for each improvement suggested, up to 4]
- 1 mark: Measure more sites along the river profile (more than 3).
- 1 mark: Repeat the study during different seasons/times of year.
- 1 mark: Take depth measurements at smaller/more regular intervals.
- 1 mark: Use multiple groups to repeat measurements and take a mean/average to spot anomalies.
- 1 mark: Use more advanced digital equipment (like a digital flowmeter for all sites).

(h) [3 marks total - 1 mark per valid explanation, up to 3]
- 1 mark: Urbanization creates impermeable surfaces, causing rapid runoff, raising river discharge/velocity.
- 1 mark: Deforestation reduces interception, leading to faster peak discharge.
- 1 mark: Reservoirs/dams regulate water release, keeping discharge and velocity low/stable.
- 1 mark: Channelization lowers friction, speeding up velocity.