What causes the velocity of a P-wave to speed up when it enters the inner core?
A) The inner core is a much more dense material than the outer core.
B) The inner core is a much less dense material than the outer core.
C) The inner core is liquid,and thus the wave speeds up.
D) The P-wave no longer has to compete with the S-wave for energy.

Question

Quizplus · Accepted Answer

The inner core is composed of solid iron and nickel, which are much more dense materials than the liquid iron and nickel in the outer core. This denser material causes the P-wave to speed up as it travels through it.

What Causes the Velocity of a P-Wave to Speed Up