Question

explain earthquakes briefly

Answer 1

earthquake is a natural phenomenon in which the land start to shake due to the pressure inside of Earth and the landslides....
Earthquake are measured using observations from seismometers. The magnitude of an earthquake, and the intensity of shaking, is usually reported on the Richter scale.
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Answer 2

it is a type of occurance in which earth shakes and we feel that earth is moving . it was mainly because of tectonic plates which is in earth when there tectonic plates move earth Shakes and there tectonic plates can move in towards each other , move away from each other etc