What Happens Inside a Rock as a Wave Front from an S

question 8

Multiple Choice

What happens inside a rock as a wave front from an S wave passes through?

• A)The little parcel of rock rotates about its own location in an ellipse until the wave passes.
• B)The little parcel of rock shimmies from side to side as the wave passes, with the greatest motion at the Earth's surface, dying out with depth.
• C)The volume of the rock stays fixed, but it shears back and forth, distorting the rock's internal shape as the wave passes through.
• D)The rock moves toward and away from the earthquake as the volume of the material alternately expands and contracts, changing the rock's density while the compression-rarefaction wave passes through.

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