All Natural Hazards Flashcards
Describe the physical processes that happen at constructive plate margin.
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At a constructive plate margin magma rises between two tectonic plates. The plates move away from each other due to ridge push and slab pull. The magma cools to form a new plate. On land rift valleys form such as the East African rift valley. Where two oceanic plates move apart new islands can be formed e.g. Iceland.
Describe the physical processes that happen at constructive plate margin.
How can natural hazards be classified?
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- Tectonic hazards
- Atmospheric hazards
- Geomorphological hazards
- Biological hazards
How can natural hazards be classified?
Give an example of a location where volcanoes occur at a volcanic hot spot.
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Hawaii, Yellowstone and The Deccan Traps.
Give an example of a location where volcanoes occur at a volcanic hot spot.
Give two possible reasons why tectonic plates move.
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Convection currents & Slab pull (+ ridge push).
Give two possible reasons why tectonic plates move.
What factors affect hazard risk?
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Factors include:
- An increase in the number of people vulnerable to the natural hazard (e.g. population growth & increased population density close to hazard-prone areas)
- An increase in the frequency and magnitude of the natural hazard
- A decrease in the number of people capable of coping with the natural hazard
What factors affect hazard risk?
