Subduction occurs at what geological feature?

Subduction occurs at what geological feature?

• A. Ridges
• B. Volcanoes
• C. Trenches
• D. Islands

Answer: (C)

Subduction happens where one tectonic plate sinks beneath another at a convergent boundary. The surface sign of this process is a trench—a deep, elongated depression in the ocean floor at the boundary where the sinking plate begins to descend. This trench marks the edge of the overriding plate and the start of the subducting slab’s descent. The downward motion also melts mantle rocks to feed magma that can form volcanic arcs inland from the trench. Ridges, by contrast, form where plates move apart and new crust is created, not where crust sinks. Islands can be outcomes of volcanic activity related to subduction, but the defining feature of subduction is the trench.

Subduction happens where one tectonic plate sinks beneath another at a convergent boundary. The surface sign of this process is a trench—a deep, elongated depression in the ocean floor at the boundary where the sinking plate begins to descend. This trench marks the edge of the overriding plate and the start of the subducting slab’s descent. The downward motion also melts mantle rocks to feed magma that can form volcanic arcs inland from the trench. Ridges, by contrast, form where plates move apart and new crust is created, not where crust sinks. Islands can be outcomes of volcanic activity related to subduction, but the defining feature of subduction is the trench.