First type of earthquake wave the shake side to side. a)p wave b)s wave

The correct option is P WAVE.
There are two major type of seismic wave, the primary wave and the surface wave [S wave].
The P wave is the first type of wave and is called the primary wave. The P wave is the fastest type of seismic wave, it can move through solid rocks and fluids. Because of the force of P wave, particles usually move in the same direction as the P wave.

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