Final answer:
At a convergent boundary, subduction zones form as one plate sinks beneath another, leading to various geologic features such as deep ocean trenches and volcanoes.
Explanation:
At a convergent boundary, where tectonic plates collide, different outcomes can occur depending on the type of plates involved. Subduction zones form when an oceanic plate sinks beneath a continental plate or another oceanic plate, resulting in deep ocean trenches, earthquakes, and volcanic activity forming island arcs.
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