What Causes the Velocity of a P-Wave to Slow Down

question 2

Multiple Choice

What causes the velocity of a P-wave to slow down when it enters the outer core?

• A) The outer core is a much more dense material than the mantle.
• B) The outer core is a much less dense material than the mantle.
• C) The outer core is liquid, and thus the wave slows down.
• D) The P-wave no longer has to compete with the S-wave for energy.

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