An accretionary prism is
A. a triangular-shaped sedimentary structure that allows light to pass through it and into lower areas of the crust.
B. an active volcanic arc created by the subduction of one slab of ocean-crust-capped lithosphere beneath another.
C. a sedimentary basin formed between a mountain range and the continental interior.
D. a wedge-shaped zone of faults, folds, and metamorphosed rocks formed along the upper parts of a subduction zone as material is scraped off.
Answer: D
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