When an earthquake occurs, the ground may shake slightly or violently.  When the shaking is severe, it may cause furniture to move or buildings to collapse as cracks may open in the ground causing cave-ins and also causing fires.

When the magnitude is large, it may also trigger mudslides, liquefaction of the earth’s surface and even set off volcanic eruptions.

If an earthquake occurs under the sea, the movement of the ocean bottom may cause a tsunami.

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