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Why should crust and lithosphere not be confused?

Answer and explanation

Correct answer: Lithosphere includes crust and rigid upper mantle

Crust and lithosphere describe Earth in different ways. The crust is the outer chemical layer, classified mainly by its composition as continental or oceanic crust. The lithosphere is a mechanical layer: it includes the crust plus the strong, rigid uppermost part of the mantle. It forms hard tectonic plates that move over the softer, weaker asthenosphere. Therefore, the two terms overlap but are not identical.

Option A is correct because it includes both the crust and the rigid upper mantle in the lithosphere. The other choices are plainly incorrect: these structures are not parts of the atmosphere, the crust is not inside the core, and the lithosphere is not made only of water. Remembering the different bases of classification prevents confusion between a chemical layer and a mechanically strong layer.

Related tags

CrustLithosphereMechanical-Layer

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