The rigid crust and uppermost mantle are known collectively as the
A)asthenosphere.
B)lithosphere.
C)Moho.
D)Gutenberg discontinuity.
E)rigid layer.

Question

Quizplus · Accepted Answer

The term used to describe the rigid outermost layer of the Earth is the lithosphere, which includes both the crust and the uppermost mantle. The asthenosphere is a layer in the mantle that is partially molten and more ductile than the lithosphere. The Moho is the boundary between the crust and mantle, and the Gutenberg discontinuity is a zone in the mantle where seismic waves experience a sharp increase in velocity. "Rigid layer" is not a specific scientific term.

The Rigid Crust and Uppermost Mantle Are Known Collectively as the