Answers

2016-01-06T11:54:52+05:30
Earthquakes are usually caused when 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.
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2016-01-06T12:05:21+05:30
An earthquake is a sudden,violent shaking  of earth's surface.It is caused when two or more tectonic plates move slightly.When this happens, disturbances are produced in the earth’s crust, which lead to an earthquake on the surface of the Earth
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An earthquake is ground shaking caused by a sudden movement of rock in the earth’s crust. Such movements occur along faults, which are thin zones of crushed rock separating blocks of crust. When one block suddenly slips and moves relative to the other along a fault, the energy released creates vibrations called seismic waves that radiate up through the crust to the earth’s surface, causing the ground to shake.