What causes an earthquake?

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Nuclear explosion,tectonic plates  and volcano eruption are some causes for occurance of earthquake

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An earthquake (or quakes, tremors) is the shaking of the surface of the Earth. They are caused by sudden movements of the Earth's tectonic plates.

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Valcano Eruption

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Earthquakes are usually causedwhen rock underground suddenly breaks along a fault. This sudden release of energy causes the seismic waves that make the ground shake. When two blocks of rock or two plates are rubbing against each other, they stick a little. ... When the rocks break, the earthquake occurs.

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Earthquakes are caused by a sudden slip on a fault.The Earth's outer layer or crust is broken into pieces called tectonic plates which are constantly moving towards, away from or past each other. Because continents are part of these plates, they also move. An earthquake occurs when the rocks break and move as a result of stresses caused by plate movements.

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Full answer

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Volcanoes and sliding of tectonic plates

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