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There are two ways in which earthquakes happen. The first one is due to volcanic activity, the second is when the Earth's plates move into each other and release huge amounts of energy
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The crust of the earth sits on plates way down there that move. Sometimes when two of the plates have a wreck, the ground up above shifts too.
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The whole earth's surface shake during an earthquake that causes buildings to collapse, damage bridges and other structures, water saturated sandy soil becomes like a liquid mud that
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It depends on the magnitude of the earthquake, but many times aftershocks will occur after an earthquake. You may also see cracks appear in the ground.
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