Earthquakes are caused by movements of plates underneath the Earth's surface. Where these plates meet or come together are breaks in the Earth's crust called faults. (Discovery Kids)

 image from arthursclipart.org

Example: Plates and faults look a bit like hard boiled eggs with their shell cracked.

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 Plates moving

 http://www.bbc.co.uk/science/earth/natural_disasters/volcano#p00js4g3
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