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These wedges represent oceanic crust and trench sediments that have been accreted to the front of the arc, a process known as subduction zone accretion. Accretionary complexes are typically made up of a mix of turbidites of terrestrial material, basalts from the ocean floor, and pelagic and hemipelagic sediments. An accretionary prism of sediments and oceanic crust is formed. Group of answer choices.