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If S-waves stop in a layer what is the most appropriate conclusion about that layer?

Answer and explanation

Correct answer: The layer is liquid or liquid-like in behaviour

The direct answer is C: the layer is liquid or behaves like a liquid. S-waves are shear waves. They move by making particles vibrate sideways, so the material must resist shearing. Solids can do this, but liquids cannot transmit S-waves because their particles flow past one another. Thus, if S-waves stop at a boundary, the next layer is inferred to be liquid or liquid-like. A is wrong because stopping S-waves does not prove the layer is gas. B is wrong because there is no basis for saying it is completely ice. C is correct and helps explain the liquid outer core. D is irrelevant: the observation concerns Earth’s interior, not the Sun. Memory cue: P-waves pass through solids and liquids; S-waves pass through solids only.

Related tags

S-WavesLiquid-StateOuter-Core

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