Aseismogram shows that p waves travel
a. at the same speed as surface waves.
b. more slowly than s waves.
c. at the same speed as s waves.
d. faster than s waves.

A seismogram shows that P waves travel faster than S waves. The answer is letter D. This is because P waves can push and pull the sound waves through a liquid or solid medium. The S wave can only move to the solid medium and solids have more compact molecules than the liquid so it travels slow.