Earthquakes are usually caused when rock beneath the ground suddenly breaks in the path which it will travel. This sudden release of energy causes certain waves which make the ground shake in terror. When two blocks of rock or two plates rub against each other, they stick a little,and hence due to the increased pressure setup,there increases the chance of earthquake.

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Earth quakes happen when two plates/rocks rub on each other.and when those rocks broke the earth quakes quakes are the sudden shaking or trembling of the surface of the earth. Hope this helps u.
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