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Volcanoes and Earthquakes: Primary wave

Grade Levels: 3 - 12
Length: 00:00:19
Website: http://www.uen.org/emedia
Usage rights: Download and retain personal copies in perpetuity.

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Primary waves are the fastest moving type of seismic wave. They are compression waves, which means that rock particles are pushed or compressed in the direction of the wave and then bounce back.

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