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3
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An area to indicate no record of earthquakes
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6
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Fragments less than 2 mm(about 1/8inch) in diameter of lava or rock blasted into the air by volcanic explosions
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7
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A steep-sided mound that forms when very viscous lava is extruded from a volcanic vent
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8
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A break in rock due to shearing, where rocks on either side of the fault surface move past each other with little upward or downward movement
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9
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The maximum heigth of a wave crest or depth of a trough
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10
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A plastic-like layer below the lithosphere
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11
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A break in rock due to compression, where rocks above the fault surface move upward and over the rocks below the fault surface
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13
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A scientist who studies earthquakes and seismic waves
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15
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Waves that travel away from an earthquake's focus and move through earth by causing particles in rock to vibrate at right angles to the direction of the wave
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16
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A group of volcanoes located in the Pacific Ocean
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17
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An underwater mountain range where magma cools from new ocean crust
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19
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The measure of the energy released by an earthquake
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