Notice the part of this image labeled "continued trench rollback." What is happening in "trench rollback"?
A) Old, dense lithosphere sinks, creating slab suction that pulls the upper plate toward the trench.
B) Continued tension on the plate results in rifting, dropping blocks of continental crust.
C) The trench gets deeper as the descending plate locks against the overriding plate and pulls it down.
D) Rising magma plutons melt the base of the lithosphere to create a depression.
Answer: A
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