Which layer of Earth is composed of both the crust and the rigid mantel?

Answer: The lithosphere is the solid, outer part of the Earth, extending to a depth of about 100 kilometers (62 miles). The lithosphere includes both the crust and the brittle upper portion of the mantle. The lithosphere is both the coolest and the most rigid of Earth's layers.

Lithosphere

Explanation:

The lithosphere is the strong, external piece of the earth, stretching out to a profundity, and it incorporating both the coolest and the most investing of earths layers