What causes an earthquake?

Earthquakes are usually caused when rock underground suddenly breaks along a fault. This sudden release of energy causes seismic waves to be released, causing the ground to shake.

Earthquakes are caused by movement in the tectonic plates(known as plate tectonics).

This usually happens in plate boundaries(where one plate meets another), due to the pressure that builds up as the plates try to move, since tectonic plates are constantly moving

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