How do earthquake-generated waves help scientists deduce the internal structure of Earth?
A. Secondary waves are detected at a seismometer when they pass through solid materials.
B. The path of waves bends as they travel through material of different density.
C. Primary waves are detected at a seismometer when they pass through solid or liquid materials.
D. Earthquake-generated waves can be detected and studied anywhere in the world.
E. All of these choices are correct.
Answer: E
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