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DEFINE P-WAVE AND S-WAVE.
P-WAVE: P-waves are type of elastic wave, also called seismic waves, that can travel through gases (as sound waves), solids and liquids.
S-WAVE: A type of seismic wave, the S-wave, secondary wave, or shear wave (sometimes called an elastic S-wave) is one of the two main types of elastic body waves, so named because they move through the body of an object, unlike surface waves.