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The deepest portions of the subducting plate get pulled under by the subducted plate. This is how the trench is formed. this process is at work when any subduction occurs.

An oceanic-continental subduction occurs when ocean crust sinks under continental crust. The oceanic crust sinks because it is colder and denser than the continental crust. At these sites, deep-ocean trenches form, along with coastal mountains.

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Q: Why do deep-ocean trenches form at both types of subduction?
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