20. which statement accurately describes a p wave?
a. ap wave can travel through liquids.
b. ap wave travels more slowly than an swave.
c. ap wave moves particles up and down or side to side.
d. ap wave can move through solid rock only.

A. A P wave can travel through liquids.  

Explanation:

A P wave is a longitudinal wave. It can travel through both solids and liquids.

D. is wrong. A P wave is not limited to solid rock.

B. is wrong. A P wave travels faster than an S wave.

C. is wrong. A P wave moves particles in the same direction as the wave is travelling.

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