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12 Cards in this Set
- Front
- Back
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What is the lithosphere?
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The strong outer layer of the earth
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What is the asthenosphere?
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The weaker, more fluid internal layer of the earth
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What is isostasy?
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Loads on the earth's surface are supported by buoyancy. The low-density crust floats relative to the high-density mantle of the asthenosphere.
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What are divergent boundaries?
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Rides/spreading centers
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What are convergent boundaries?
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Subduction zones
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What are conservative boundaries?
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Transform faults
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Why does the ocean floor have a magnetic pattern?
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When lava cools to below 550, atoms line up in the direction of earth's magnetic field
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Smaller earthquakes occur at
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spreading zones
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Larger earthquakes form at
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transform faults
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Gigantic earthquakes form at
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Subduction zones
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The break up of the African continent will be caused by
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The three rift zones in the Red Sea, East African Rift Valley, and the Gulf of Aden
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What is the rift-to-drift sequence?
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The formation of a new spreading center. 1.) Rise of hot asthenosphere. 2.) Extension of lithospehre due to heating. 3.) Litosphere is rifted apart. 4.) New lithosphere created.
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