Earth's liquid and solid layers were discovered by studying the propagation of seismic waves through Earth's interior. P-waves ________; S-waves ________.
A. are the fastest of all seismic waves and the first to register on a seismograph; are the second to register on a seismograph
B. can travel through solid granite, magma, water, or air; can travel only through solids-not in fluids
C. compress and expand the rock as they move through it; vibrate the particles of their medium up and down and side to side
D. all of the above
Answer: D
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