A prism- or wedge-shaped, structurally complex zone of faults, folds, and mostly metamorphosed rocks that form along the upper parts of a subduction zone where sedimentary material and oceanic crust are scraped off the downgoing slab is called an):
A) accretionary prism
B) subduction wedge
C) foreland basin
D) passive margin

Question

Quizplus · Accepted Answer

An accretionary prism forms in subduction zones where sediments and oceanic crust from the subducting plate are scraped off and accumulate on the edge of the overriding plate, leading to a complex zone of faults, folds, and metamorphosed rocks.

A Prism- or Wedge-Shaped, Structurally Complex Zone of Faults, Folds