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8 Cards in this Set
- Front
- Back
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magma
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melted rock under the surface of the earth's crust
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plate tectonics
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The theory that explains how the plates of the earth move
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original horizontality
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Rocks form in layers
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epicenter
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the point on the earth's surface directly above the focus
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focus
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the point where an earthquake starts
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seismograph
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instrument used to measure the magnitude of an earthquake
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seismic waves
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movements of the earth's crust during an earthquake.
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magnitude
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the size/strength of the waves
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