Aprism- 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 a(n):

Accretionary prism

Explanation:

An accretionary prism or accretionary wedge is a mass of sedimentary material that is scraped off the descending slab at the boundary of a convergent plate

The sediments are pushed into thick vertical piles, where the pressure expels water from the sediments and converts them into rocks.

answer( season );