As the descending plate bends downward, a long, steep, narrow depression in the seafloor where one plate sinks under another plate may develop; this is called a(an).

When one tectonic plate bends and sinks beneath another at a convergent boundary, it creates a long, deep depression in the seafloor called an ocean trench. A mid-ocean ridge forms where plates move apart, while a rift valley is a valley associated with crust pulling apart.

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