Question

What is earthquake?How it occurs

Answer 1

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. ... When the rocks break, the earthquake occurs.

OR

Earthquakes are caused by tectonic movements in the Earth's crust. The main cause is that when tectonic plates , one rides over the other, causing orogeny collide (mountain building), earthquakes.


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Answer 2

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