Answer:
B. The number of wave cycles that pass through a specific point within a given time period.
I am pretty sure that the only statement which is true for particles of the medium of an earthquake P-wave is being shown in the option : b)vibrate parallel to the wave, forming compressions and rarefactions. As you know, it can be formed in two ways : from alternating compressions and rarefactions or primary wave. I bet you will agree with me.
1 millimeter.
1 centimeter is 1/100th of a meter (1 cent of a meter).
1 millimeter is 1/1000th of a meter.
