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Earthquakes A-Z

Aftershock   A lesser tremor that takes place after the main earthquake. There may be many aftershocks, sometimes continuing for months afterwards.

Crust   The rocky outer layer of the Earth.

Earthquake   A shaking or trembling of the ground, caused by the sudden movement of rocks in the Earth’s crust. Most earthquakes happen along the edges of tectonic plates, when plates collide or slide past each other. The two plates lock together before the pressure becomes too much and the rocks suddenly snap along a crack called a fault.

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