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is relatively newstudy earthquakesare waves of energyproduce seismic wavesseveral kinds of seismic wavesstudyhave happenedtells

Seismologists study earthquakes.Explosions and rocks breaking inside the earth cause seismic waves.They predict this by studying where earthquakes have happened in the past.

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A tsunami will have crashed on the city's harbor.School officials will have moved children to a shelter.All traffic will have come to a stop.The Board of Health will have created a supply of clean water.

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