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