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shaking and vibration at the surface of the earth resulting from underground movement along a fault plane of from volcanic activity
(geology) the mechanical process of wearing or grinding something down (as by particles washing over it)
(geology) a crack in the earth's crust resulting from the displacement of one side with respect to the other
a relatively narrow strip of land (with water on both sides) connecting two larger land areas
the theory that pieces of Earth's crust are in constant motion, driven by convection currents in the mantle
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