Suppose an earthquake occurs on an imaginary planet. Scientists on the other side of the planet detect primary waves but not secondary waves after the quake occurs. This suggests that:

Question

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The fact that only primary waves (P-waves) are detected suggests that the waves are traveling through solid rock, but the absence of secondary waves (S-waves) suggests that there is a layer of liquid in the planet's interior. S-waves cannot travel through liquid, so their absence would indicate the presence of a liquid layer in the planet's interior.

Suppose an Earthquake Occurs on an Imaginary Planet