Question

Complete this sentance

Below the lithosphere is the __________________ which is a shallow layer of the upper mantle.

Answer 1

Below the lithosphere is the asthenosphere which is a shallow layer of the upper mantle. The asthenosphere is a highly viscous and ductile region that lies directly beneath the lithosphere, extending from about 80 to 200 km (50 to 120 miles) in depth. The asthenosphere is responsible for the movement of tectonic plates and is considered to be the driving force behind plate tectonics.

Answer 2

Below the lithosphere is the asthenosphere which is a shallow layer of the upper mantle.