Select the statement that best describes how the process of plate tectonics circulates materials between the asthenosphere and the lithosphere.
A. Some lithosphere becomes asthenosphere at mid-ocean spreading centers and reenters the lithosphere at subduction zones.
B. Some asthenosphere becomes lithosphere at mid-ocean spreading centers and reenters the asthenosphere at subduction zones.
C. The materials that form the asthenosphere never mix with the materials that form the lithosphere.
Answer: B
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