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Which is the thinnest major layer of Earth?

Answer and explanation

Correct answer: Crust

Direct answer: Option C is correct. The crust is Earth’s thin, solid outer layer. Below it lies the much thicker mantle, and still deeper are the outer and inner core. The crust may be about 5–10 km thick under oceans and roughly 30–70 km under continents, so it is thin compared with the mantle and core. A is wrong because the mantle is a very thick layer. B is wrong because the core includes enormous inner and outer regions and is not the thinnest major layer. D is wrong because the outer core is only one part of the core and is much thicker than the crust. C works because “crust” means Earth’s thin outer skin. Exam cue: outermost and thinnest major layer usually points to crust.

Related tags

CrustThinnest LayerEarth Structure

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