Question

What do you mean by earthquake ? How is it formed ?
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Answer 1

Answer:

An earthquake is caused by a sudden slip on a fault. ... When the stress on the edge overcomes the friction, there is an earthquake that releases energy in waves that travel through the earth's crust and cause the shaking that we feel. In California there are two plates - the Pacific Plate and the North American Plate.

Answer 2

An earthquake is the sudden movement or trembling of the Earth's tectonic plates, that creates the shakes of the ground. This shaking can destroy buildings and break the Earth's surface. . Earthquakes are measured using watching from seismographs.

The tectonic plates are always slowly moving, but they get stuck at their edges due to friction. When the stress on the edge overcomes the friction, there is an earthquake that releases energy in waves that travel through the earth's crust and cause the shaking that we feel.

hope it helps you