Which is Earth's most outer layer, consisting of crust and upper mantle?

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Multiple Choice

Which is Earth's most outer layer, consisting of crust and upper mantle?

Explanation:
The outermost solid shell of Earth is the lithosphere, which combines the crust and the rigid upper part of the mantle. This layer forms the tectonic plates that move on the weaker, more ductile layer beneath it called the asthenosphere. The asthenosphere lies beneath the lithosphere, not at the surface, and it allows plate motion. The mesosphere is the lower mantle, and the core is deep inside Earth. So the outermost layer that includes crust and upper mantle is the lithosphere.

The outermost solid shell of Earth is the lithosphere, which combines the crust and the rigid upper part of the mantle. This layer forms the tectonic plates that move on the weaker, more ductile layer beneath it called the asthenosphere. The asthenosphere lies beneath the lithosphere, not at the surface, and it allows plate motion. The mesosphere is the lower mantle, and the core is deep inside Earth. So the outermost layer that includes crust and upper mantle is the lithosphere.

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