what is mean by earthquake ?
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earthquake :
sudden vibrations on the earth and shaking of the earth surface is called earthquake .
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earthquake. [ ûrth′kwāk′ ] A sudden movement of the Earth's lithosphere (its crust and upper mantle). Earthquakes are caused by the release of built-up stress within rocks along geologic faults or by the movement of magma in volcanic areas. They are usually followed by aftershocks.
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