Natural hazards — AQA GCSE Geography
Natural hazards explained
Natural hazards covers 4 specification points, including Natural hazards pose major risks to people and… and Definition of a natural hazard..
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Natural hazards pose major risks to people and property.
Natural hazards are extreme environmental events that threaten significant disruption, damage, and loss of life. The risks they pose are categorised into impacts on people and impacts on property. Risks to people include injury, death, displacement, and the spread of diseases following events like floods. Risks to property involve the destruction of homes, infrastructure such as roads, and businesses, leading to severe economic losses. For example, a tropical storm can destroy coastal housing (property risk) while simultaneously threatening the lives of residents through storm surges (people risk). Understanding these major risks is crucial for developing effective mitigation strategies to reduce vulnerability in affected communities.
Definition of a natural hazard.
A natural hazard is defined as a naturally occurring event that has the potential to cause loss of life, injury, property damage, or environmental degradation. Crucially, an extreme natural event only becomes a hazard when it interacts with human populations. For example, an avalanche in an uninhabited mountain range is merely a natural event, whereas the same avalanche striking a ski resort is a natural hazard. Natural hazards are typically classified by their physical processes, such as tectonic hazards (earthquakes) and atmospheric hazards (tropical storms). Understanding this definition helps geographers assess vulnerability and risk, as the severity of a hazard depends on both the physical event and the human context it affects.
Types of natural hazard.
A natural hazard is a naturally occurring physical event with the potential to cause loss of life, injury, or damage to property and infrastructure. An extreme event in an unpopulated area is not a hazard. Natural hazards are categorised into distinct types, primarily tectonic and climatic (meteorological). Tectonic hazards originate from the movement of the Earth's crust, including earthquakes, volcanic eruptions, and tsunamis. Climatic hazards are driven by weather and climate systems, encompassing tropical storms, droughts, and floods. Other types include geomorphological hazards like landslides and avalanches. Understanding these categories is essential for predicting occurrences and mitigating their impacts on vulnerable human populations.
Factors affecting hazard risk.
Hazard risk is the probability that a natural hazard will cause damage or loss of life. Several factors affect this risk by altering a population's vulnerability. Urbanisation increases risk because densely populated cities concentrate people and infrastructure, amplifying exposure to earthquakes. Poverty is a critical factor; poorer populations often live in precarious locations, such as steep slopes prone to landslides, and lack resources for resilient housing. Climate change increases the frequency and intensity of climatic hazards, such as tropical storms. Furthermore, farming on marginal land, like floodplains or volcanic slopes, places communities directly in harm's way despite the lure of fertile soils.
Your focus
- Categorise the impacts of natural hazards into risks to people and risks to property.
- Explain how different types of natural hazards pose varying threats to human populations.
- Evaluate the severity of risks based on the interaction between the hazard and the affected community.
Show all 12 objectives
- Define the term natural hazard accurately, including the threat to human life and property.
- Distinguish between a natural event and a natural hazard using appropriate examples.
- Identify different categories of natural hazards based on their physical origins.
- Define the term natural hazard.
- Categorise different natural hazards into tectonic, climatic, and geomorphological types.
- Distinguish between a natural event and a natural hazard based on human exposure.
- Identify the key human and physical factors that affect hazard risk.
- Explain how poverty and urbanisation increase a population's vulnerability to natural hazards.
- Describe the impact of climate change on the frequency and intensity of climatic hazards.
Natural hazards flashcards
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Natural hazard
Natural hazards exam tips
Marking Points
- Identify specific risks to people, such as injury, death, or displacement.
- Identify specific risks to property, such as damage to buildings, infrastructure, or agricultural land.
- Recognise that the severity of risk depends on the vulnerability and capacity of the population to cope.
- Distinguish between primary risks (immediate damage) and secondary risks (disease, economic decline).
- State that a natural hazard is a naturally occurring physical event.
- Explain that the event must have the potential to cause harm to people, property, or the environment.
- Differentiate between a natural event (no human impact) and a natural hazard (potential human impact).
- Categorise natural hazards into types, such as tectonic, atmospheric, or geomorphological.
- Identify tectonic hazards as those caused by the movement of the Earth's crust, such as earthquakes and volcanoes.
- Identify climatic or meteorological hazards as those caused by weather and climate, such as tropical storms and droughts.
- Recognise that a natural event only becomes a hazard when it poses a threat to people or property.
- Classify geomorphological hazards, such as landslides and avalanches, as a distinct type of natural hazard.
- Explain how urbanisation increases hazard risk by concentrating populations and infrastructure in vulnerable areas.
- Describe how poverty increases vulnerability, as low-income communities often lack resources for mitigation, preparation, and recovery.
- Identify climate change as a factor that increases the frequency and severity of weather-related hazards.
- Explain that farming on marginal land, such as floodplains, increases exposure to hazards like flooding.
Examiner Tips
- 💡When asked about risks, always try to provide one example affecting people and one affecting property to show a balanced understanding.
- 💡Use specific terminology such as infrastructure instead of just saying buildings and roads.
- 💡Link the risk to the specific type of hazard if a scenario is provided in the question.
- 💡Memorise a concise definition: A natural event that threatens people or has the potential to cause damage, destruction, and death.
- 💡If asked to define a natural hazard, always mention the human element, as an event without people is not a hazard.
- 💡Be prepared to identify which events in a multiple-choice list fit the definition of a natural hazard versus a human-induced hazard.
- 💡When asked to identify a type of hazard, look for keywords like 'crust' for tectonic or 'weather' for climatic.
- 💡Use specific examples, such as the Nepal earthquake for tectonic or Typhoon Haiyan for climatic, to illustrate the different types of hazards.
- 💡Read multiple-choice options carefully to ensure you do not select a human-induced disaster when a natural hazard is required.
- 💡In multiple-choice questions, ensure you link the correct factor to the specific type of hazard it affects, such as climate change to tropical storms.
- 💡Use the concept of 'Risk = (Hazard x Vulnerability) / Capacity to cope' to help structure your understanding of the factors involved.
- 💡When evaluating risk, always consider both physical factors (like climate change) and human factors (like urbanisation and poverty).
Common Mistakes
- Confusing risks to people with risks to property; ensure you correctly categorise impacts like homelessness as affecting people, while destroyed houses affects property.
- Assuming all natural hazards pose the exact same risks; remember that a drought poses different risks (crop failure, starvation) compared to an earthquake (building collapse).
- Forgetting secondary risks; do not limit your understanding to immediate impacts, as long-term risks like economic recession or disease outbreaks are also major threats.
- Defining a natural hazard simply as an extreme event; you must include the potential threat to people or property for the definition to be complete.
- Confusing a natural hazard with a natural disaster; a hazard is the potential threat, whereas a disaster is the actual realisation of that hazard causing significant impact.
- Believing human-made incidents (like industrial spills) are natural hazards; ensure you specify that the event must be naturally occurring.
- Confusing tectonic and climatic hazards; correct this by remembering that tectonic hazards relate to the Earth's crust, while climatic hazards relate to the atmosphere and weather.
- Assuming any extreme natural event is a hazard; correct this by noting that an event must threaten human life, activities, or property to be classified as a hazard.
- Believing human-caused disasters are natural hazards; correct this by distinguishing between purely anthropogenic events (like oil spills) and natural hazards, though humans can exacerbate the latter.
- Stating that climate change causes earthquakes; correct this by specifying that climate change only affects the risk of climatic hazards, not tectonic ones.
- Assuming hazard risk is only about the physical severity of the event; correct this by including human factors like vulnerability, poverty, and population density.
- Confusing the hazard itself with the risk; correct this by defining risk as the probability of the hazard causing harm to people or property.