The accretionary wedge is like the accretionary prism and the definition of that is : *a mass of sedimentary material scraped off a region of oceanic crust during subduction and piled up at the edge of the overriding plate (source : dictionary)* and the formation is when two plates crash and one slides under the other one I believe and sand ad sediment go into the little open space between them that give you a wedge. Hope I helped.

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The three faults are normal, reverse, and strike-slip. In the normal fault the stress is vertical when its at its largest and at its smallest its is horizontal. For the reverse the smallest stress is vertical and the larger stresses are horizontal. And as for the strike slip the the intermediate stress is vertical and the smallest and largest stresses are horizontal.
(what I mean by large, intermediate, and small is least or most comprehensive)