Welcome to the Challenge of Natural Hazards!
In this chapter, we are going to explore the powerful forces of nature that can change lives in an instant. Geography is all about the relationship between people and the planet, and nowhere is that relationship more intense than during a natural hazard. Don't worry if some of the terms seem new; we will break them down piece by piece!
1. What is a Natural Hazard?
A natural hazard is a natural process or event that has the potential to cause widespread injury, loss of life, or damage to property and evidence.
It is important to remember that a natural event (like a storm or an earthquake) only becomes a hazard when it affects people. If a massive earthquake happens in the middle of a deserted wasteland where no one lives, it is just a natural event, not a hazard.
The "Empty Room" Analogy
Imagine a heavy bookshelf falls over in an empty, abandoned house. It's a bit of a mess, but no one is hurt. Now, imagine that same bookshelf falls over in a crowded classroom. Suddenly, it’s a big problem! A natural hazard is like that falling bookshelf—it only matters because people are nearby.
Quick Review: The Definition
• Natural Event: Something happens in nature (e.g., a wave in the ocean).
• Natural Hazard: That event threatens people or their belongings (e.g., a Tsunami hitting a coastal city).
Key Takeaway: For something to be a hazard, there must be a risk to humans or our property.
2. Types of Natural Hazard
Geographers usually split natural hazards into two main "families" based on where they come from. Think of it as Hazards from the Ground and Hazards from the Sky.
Geological Hazards (The Ground)
These are caused by land and tectonic processes. They mostly happen because of the movement of the Earth's plates. Examples include:
• Earthquakes
• Volcanic eruptions
• Landslides
• Tsunamis
Meteorological Hazards (The Sky)
These are caused by weather, atmosphere, and climate. Examples include:
• Tropical storms (Hurricanes/Typhoons)
• Extreme heat or Cold
• Droughts
• Flooding
Memory Tip: Think of a "Meteorologist" on the news—they talk about the weather. So, Meteorological hazards are Weather hazards!
Key Takeaway: Hazards are either Geological (tectonic/land) or Meteorological (weather/climate).
3. Factors Affecting Hazard Risk
Hazard risk is the probability or chance that a person or community will be harmed by a natural hazard. Not everyone in the world faces the same level of risk. Several factors can make a person more or less likely to be affected.
Factor 1: Urbanisation
More and more people are moving to cities (urbanisation). When a city is hit by a hazard, there are more people packed into a small space. This means the potential for death or injury is much higher compared to a rural village.
Factor 2: Poverty
In many parts of the world, people cannot afford to live in safe areas. They might build houses on unstable hillsides (prone to landslides) or in low-lying areas (prone to flooding). Additionally, poorer areas often have buildings that aren't strong enough to survive an earthquake.
Factor 3: Farming
It sounds strange, but people often choose to live in dangerous places because the land is great for farming! For example, volcanic soil is incredibly fertile and rich in nutrients. Farmers will risk living near a volcano to get better crops, which increases their hazard risk.
Factor 4: Climate Change
A warming planet means there is more energy in the atmosphere. This can make meteorological hazards like tropical storms more intense and more frequent. It can also lead to more extreme droughts or floods in areas that didn't use to have them.
Did you know? Some scientists believe that as sea levels rise due to climate change, the hazard risk for coastal cities like London or New York increases significantly every single year!
Common Mistake to Avoid
Don't confuse "Hazard" with "Risk." The hazard is the event itself (the earthquake). The risk is how likely it is to hurt you specifically. If you live in a house built with "earthquake-proof" springs, your risk is lower than someone living in a mud-brick house, even if the hazard is exactly the same.
Key Takeaway: Hazard risk is affected by where we live (Urbanisation/Farming), how much money we have (Poverty), and changes to the planet (Climate Change).
Summary Checklist
Before you move on to the next chapter, make sure you can:
1. Define what a natural hazard is (and why people are the key ingredient!).
2. List three geological hazards and three meteorological hazards.
3. Explain why urbanisation and poverty increase the risk of being hurt by a hazard.