What Does a P Wave Do to the Rock It

question 9

Multiple Choice

What does a P wave do to the rock it passes through?

• A) It lifts it up and down in a wavelike motion (perpendicular to the advancing wave front), distorting the rock's shape while holding its volume (and density) constant.
• B) It causes the rock to move in little vertical circles as the wave advances.
• C) It alternately compresses and expands the rock (like the bellows of an accordion) along the direction of the advancing wave. This "preserves the rock's shape", while changing its density in a periodic fashion.
• D) It causes the rock to wiggle from side to side as the wave advances.

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