All Natural Hazards Flashcards
What is the lithosphere?
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The rigid layer formed by the crust and upper mantle.
What is the lithosphere?
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?
Identify the two types of tectonic crust.
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Oceanic and continental crust
Identify the two types of tectonic crust.
Give an example of two tectonic plates that form a conservative plate margin.
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North American and Pacific plates, Cocos and Nazca plates, Arabian and Indo-Australian plates and the African and Eurasian plates.
Give an example of two tectonic plates that form a conservative plate margin.
Describe the physical processes that happen at a destructive plate margin.
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When oceanic and continental plates collide the denser oceanic plate subducts the continental plate and enters the mantle where it melts. Magma can rise through the lithosphere and erupt as lava through volcanoes. As the oceanic plate subducts, it gets stuck due to friction. Pressure builds up until it is released as an earthquake.
Describe the physical processes that happen at a destructive plate margin.
