Plate Margins Flashcards
What is the name of the upper portion of the mantle?
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The asthenosphere
What is the name of the upper portion of the mantle?
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?
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 rift valley?
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A long, narrow valley lying between two normal geologic faults. Rift valleys usually form where the Earth’s lithosphere has become thin through extension associated with plate-tectonic processes.
What is a rift valley?
What are the characteristics of the outer core?
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The layer surrounding the inner core. A liquid layer of iron and nickel.
What are the characteristics of the outer core?
