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Which statement gives the correct comparative conclusion about usefulness of P and S waves?

Answer and explanation

Correct answer: Their different behaviour helps identify solid and liquid layers

The direct answer is A: their different behaviour helps identify solid and liquid layers. P waves are primary, compressional seismic waves. They can travel through solids, liquids and gases, although their speed changes. S waves are secondary, shear waves, and cannot travel through liquids because liquids do not support the needed sideways shear motion. By comparing where P and S waves arrive or disappear, scientists infer the state and boundaries of Earth’s layers. A is correct. B is wrong because these are earthquake waves, not weather instruments. C is wrong because they travel through Earth, not merely as sea waves. D is wrong because it says both cannot travel through liquids; P waves can. Memory cue: P passes through liquids; S stops in liquids.

Related tags

P WavesS WavesLayer State

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