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Ocean trenches have relatively steep sides falling to the ocean floor. Ocean trenches are typically caused when an oceanic crustal plate slides under a lighter continental plate or another oceanic plate. It is believed to work by density.Where one plate slides under another, this is called subduction.t least five trenches are over 6 miles (10 km) deep. The greatest ocean depth to be sounded is in the Challenger Deep of the Mariana Trench, at a depth of 11,034 m (36,201 ft) below sea level.
The ocean trenches are narrow topographic depressions in the sea. These trenches form the deepest points in the ocean and are the lowest points on earth. These trenches are formed at a particular place of plate boundary which is known as subduction zone.It happens to form when a plate in ocean hits another ocean plate or it strikes with continental plate.ow when one plate hits another plate or continental plate in the ocean then the denser plate between the two of them sinks in the mantle. The place where this plate sinks will create a deep trench on that spot of ocean.