Hazards and Structure of the Earth Flashcards

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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?
What are the characteristics of the inner core?
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A solid mass of iron and nickel. The hottest part of the Earth. Temperatures up to 5,550°C. 
What are the characteristics of the inner core?
Describe the global distribution of volcanoes and earthquakes
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Earthquakes are found along all types of plate margins. Volcanoes, however, only occur at constructive and destructive plate margins. Volcanoes are also found away from plate margins at volcanic hot spots such as Hawaii in the Pacific Ocean.

Describe the global distribution of volcanoes and earthquakes
What are the characteristics of the mantle?
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The thickest section of the Earth. Approximately 2900km.

It is made up of semi-molten rock called magma.

What are the characteristics of the mantle?
Explain ridge push and slab pull as a cause of plate movement.
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Ridge push magma rises as the plates move apart. The magma cools to form new plate material. As it cools It becomes denser and slides down away from the ridge. This causes other plates to move away from each other.
Slab pull – The denser plate sinks back into the mantle under the influence of gravity. It pulls the rest of the plate along behind it.
Explain ridge push and slab pull as a cause of plate movement.




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