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Seismograph : Device that records ground movements caused by seismic waves Richter Scale : Scale that rates an earthquake's magnitude based on size of seismic waves Shearing : Pull on the earth's crust, stretching rock Magnitude : Measurement of an earthquake's strength S Waves : Type of seismic wave that moves the ground up and down or side to side Surface Waves : When p waves and s waves reach the earth's surface Focus : Point beneath earth's surface where rock breaks under stress and causes an earthquake Epicenter : Point directly above the earthquake's focus Earthquake : Shaking and trembling of rock underneath the ground Compression : Stress that squeezes rock until it folds or breaks P Waves : Type of seismic wave that compresses and expands the ground Seismic Wave : Vibration that travels through earth carrying energy released during an earthquake

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