Trench
Volcanic
arc
Oceanic crust
Continental crust
Lithosphere
Lithosphere
Asthenosphere
Picture A
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1. Trenches are long, narrow depressions on the seafloor that form at the boundary of tectonic plates where one plate is pushed, or subducts, beneath another.
2. A continental arc is a type of volcanic arc occurring as an "arc-shape" topographic high region along a continental margin. ... The magmatism and petrogenesis of continental crust are complicated: in essence, continental arcs reflect a mixture of oceanic crust materials, mantle wedge and continental crust materials.
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