Most of the molten material that is generated above the subducting slab never reaches the surface to form a volcano.

Question

Quizplus · Accepted Answer

When the molten material is generated above the subducting slab, it may rise towards the surface due to its low density. However, most of it gets trapped beneath the overriding plate, where it can cause melting and deformation, but not necessarily result in a volcanic eruption. Only a small fraction of the magma may reach the surface through fissures or vents, forming a volcanic arc or island chain.

Most of the Molten Material That Is Generated Above the Subducting