Discussion
Consider the following statements about seismic waves.
1. P waves travel through both solids and liquids.
2. S waves travel through liquids but not solids.
3. Surface waves are confined near the ground surface.
Which of the statements are correct?
Answer: A
Correct answer: 1 and 3 only
Statements 1 and 3 are correct: P waves pass through solids and liquids alike, and surface waves are confined near the ground surface. Statement 2 has it exactly backwards. S waves travel through solids and not through liquids, since a liquid cannot sustain shear - which is the reason for the S wave shadow zone and the evidence for a liquid outer core.
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