Question

1. how do rock particles move during the passage of a p wave through the rock?

d. the particles do not move
c. in a rolling circular motion
b. back and forth parallel to the direction of wave travel
a. back and forth perpendicular to the direction of wave travel
rewatch

Explanation:

P - waves (primary waves) are longitudinal seismic waves. In longitudinal waves, the particles of the medium (here, rock particles) vibrate back and forth parallel to the direction of wave propagation. Option a describes transverse wave particle motion (like S - waves), option c is not the motion of P - wave particles, and option d is incorrect as particles do move during wave passage.

Answer:

b. back and forth parallel to the direction of wave travel