epicenter - the location on Earth’s surface directly above the focus of an earthquake, focus - the point along a fault where an earthquake begins, primary waves (P waves) - seismic waves that travel in a push-pull motion through Earth's crust, secondary waves (S waves) - seismic waves that travel in a shaking side-to-side motion through Earth's crust, seismic waves - vibrations caused by the sudden release of energy from an earthquake, surface waves - seismic waves that travel along the surface of Earth's crust, seismometer - a device that detects vibrations moving through the ground, magnitude - strength of an earthquake, earthquake - a sudden shaking of the ground caused by the movement of rock underground, tsunami - a large ocean wave caused by an underwater disturbance, fault - a break between two pieces of rock,

Earthquakes

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