1. What is the difference between primary waves (P-waves) and secondary waves (S-waves)?
A. Primary waves are elastic waves that travel faster than secondary waves that are compression waves.
B. Primary waves are compression waves that travel faster than secondary wave with elastic rope-like movement.
C. Primary waves are compression waves that travel slower than the secondary wave with elastic rope-like movement.
D. Primary waves are rolling waves and secondary waves cause horizontal shifting, both move along the Earth's surface.
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