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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.
Most trenches are around the edges of the active Pacific. Trenches are the. deepest places in Earthâs crust, 3 to 6 kilometers (1.9 to 3.7 miles) deeper than s crust, 3 to 6 kilometers (1.9 to 3.7 miles) deeper than. the adjacent basin floor. The oceanâs greatest depth is the Mariana Trench. where the depth reaches 11,022 meters (36,163 miles) below sea level.