RE Vocab (5, 6)
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| seismology | study of earthquakes
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| deformation | change in the shape of rock due to stress
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| seismic waves | wave of energy that travels away from earthquake in all directions
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| seismograph | instruments that record vibrations in the ground
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| seismogram | tracing (on paper) of earthquake motion
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| epicenter | point on Earth's surface directly above the focus
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| focus | point along a fault where the first motion of an earthquake occurs
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| volcano | vent or fissure in the Earth's surface through which magma and gases are expelled
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| magma chamber | body of molten rock that feeds a volcano
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| vent | opening in Earth's surface through which volcanic material passes
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| pyroclastic material | forms when magma is blasted into the air and hardens
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| crater | funnel shaped pit near the top of the central vent of a volcano
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| caldera | a large depression that forms when the magma chamber empties and causes the ground above to sink
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| rift zone | area of deep cracks between two divergent tectonic plates
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| hot spots | volcanically active area far from a tectonic plate boundary
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