Out of these 5: underwater trench, island arc, batholith, volcano, igneous rocks.|||You forgot one: strip malls are also not found in a subduction zone.|||Batholith.
A batholith is a large, single chunk of rock that has been intruded into the crust, but not erupted. Also called a pluton. They are very large, and they cool very slowly over time. At subduction zones, the magma occurs as extrusive volcanics.
The convergence of two plates and subduction of one creates a trench. Convergence and subduction of two oceanic plates creates an island arc. Melted crust material beneath the subduction zone is erupted as volcanoes, and volcanoes produce only igneous rock.
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