What can occur at a subduction zone?

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Subduction zones showcase three characteristic features: trenches, volcanic activity, and earthquakes. When one tectonic plate sinks beneath another, a deep ocean trench forms at the boundary. The descending slab releases water into the overlying mantle, lowering melting temperatures and producing magma that feeds volcanoes along a volcanic arc. The intense interaction between plates also causes strong earthquakes. While mountain building can occur from compression and uplift in some regions, rivers are not a direct hallmark of subduction, and erosion or wind deposition aren’t primary tectonic outcomes here. So the best description of what can occur at a subduction zone is the combination of volcanoes, trenches, and earthquakes.