By: Kjerstin Olsen  Earthquakes are usually caused when rock underground suddenly breaks along a fault.

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Presentation transcript:

By: Kjerstin Olsen

 Earthquakes are usually caused when rock underground suddenly breaks along a fault.

 This sudden release of energy causes the ground to shake.

 When two blocks of rock or two plates are rubbing against each other they stick. The rocks do not slide smoothly, they catch on each other. After a while, the rocks break because of all the pressure built up. When the rocks break, an earthquake occurs.

 The spot underground is called the focus of the earthquake.

 The plate directly above the focus, the area on the surface, is called the epicenter of an earthquake.

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