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Both in the ocean
Deep Trench in the ocean floor. It can sometimes be mistaken for a mid-ocean ridge.
A ridge, specifically the Mid-Atlantic Ridge.
hard to say
Trenches are formed by divergent plates, Whereas Ridges are formed by plate in collision.
Abyssal Plain,Ocean Trench,Seamount,and Mid-Ocean ridge
Would not be surprised to find 120 degrees of separation.
usually a rift or trench
It could be called a trench, crevice, ocean ridge, or abyss.
The further away a point is from the mid-ocean ridge, the deeper the sediment layer should be. Because the ocean floor is relatively new nearer the ridge, sediments have had less time to accumulate.
A convergent boundary between a continental plate and an oceanic plate results in a ocean trench because the basalt in the oceanic plate is denser than the granite in the continental plate, causing the oceanic plate to sink underneath, into the mantle.
The ridge of a trench is the parapet.