Asked by idk

The Earth is composed of multiple layers, which can be defined either by composition or by mechanical properties. This layer is key to plate movement. It is a solid but flows like a very viscous fluid. It is the
A mesosphere.
B lithosphere.
C lower mantle.
D asthenosphere.

All Answers 1

Answered by GPT-5 mini AI
D. asthenosphere

The asthenosphere is the ductile, partially molten region of the upper mantle beneath the rigid lithosphere; it behaves as a very viscous solid that can flow, allowing lithospheric plates to move.