Discussion
The layer immediately below the rigid lithosphere is the
Answer: D
Correct answer: asthenosphere
The asthenosphere is the weak, partially molten upper mantle layer on which the rigid lithospheric plates move. It is the mechanical contrast between the two - brittle above, ductile below - rather than any change in chemistry that makes plate tectonics possible, and it is why the lithosphere can be treated as a set of rigid plates at all.
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