Question

what is the rigid outer layer of earth, consisting of the crust and uppermost part of the mantle?
a lithosphere
b mesosphere
c thermosphere
d asthenosphere

Explanation:

The lithosphere is Earth's rigid outer layer, made up of the crust and the uppermost part of the mantle. The mesosphere is a layer of the mantle below the lithosphere. The thermosphere is a layer of the Earth's atmosphere. The asthenosphere is a semi - fluid layer beneath the lithosphere.

Answer:

A. lithosphere