Plate Margins Flashcards

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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?
What is a natural hazard?
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A natural hazard is a natural event such as an earthquake, volcanic eruption, tropical storm or flood that has the potential to cause death and damage.

What is a natural hazard?
How can natural hazards be classified?
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  • Tectonic hazards
  • Atmospheric hazards
  • Geomorphological hazards
  • Biological hazards
How can natural hazards be classified?
Do volcanoes and earthquakes occur at all plate margins?
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Volcanoes and earthquakes occur at all plate boundaries except at a conservative margin where only earthquakes happen.
Do volcanoes and earthquakes occur at all plate margins?
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.




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