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ggw43

Answer:

they move apart

Explanation:

when two tectonic plates move apart it causes a trench this is most common in oceans

Answer:In particular, ocean trenches are a feature of convergent plate boundaries, where two or more tectonic plates meet. At many convergent plate boundaries, dense lithosphere melts or slides beneath less-dense lithosphere in a process called subduction, creating a trench

Explanation: