Which layer is the outermost shell of the Earth, including crust and upper mantle?

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Multiple Choice

Which layer is the outermost shell of the Earth, including crust and upper mantle?

Explanation:
The key idea is identifying the rigid outer layer of Earth that includes the crust and the upper part of the mantle. This combination is the lithosphere. It forms the cool, rigid shell that makes up the tectonic plates, separating from the underlying, more ductile region called the asthenosphere. The mantle extends deeper than this outer shell, and the core sits at Earth's center, far below. So, the outermost shell that includes crust and upper mantle is the lithosphere.

The key idea is identifying the rigid outer layer of Earth that includes the crust and the upper part of the mantle. This combination is the lithosphere. It forms the cool, rigid shell that makes up the tectonic plates, separating from the underlying, more ductile region called the asthenosphere. The mantle extends deeper than this outer shell, and the core sits at Earth's center, far below. So, the outermost shell that includes crust and upper mantle is the lithosphere.

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