An accumulation of different sedimentary and metamorphic rocks combined with scraps of ocean crust is called a dome a volcanic island arc an accretionary wedge a fault-block mountain

ANSWER:

Accretionary wedge is the accumulation of metamorphic and sedimentary rocks combines with "scraps of ocean crust".

EXPLANATION:

The sediments get accreted onto a tectonic plate which is non-subducting in nature. Most of the components of accretionary wedge include marine sediments and also erosional products of volcano island arcs. Tectonic collisions are the reason for the formation of accretionary wedges. The shape of an accretionary wedge is usually a triangle and continues to grow in size when it reaches critical taper.