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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.
Oceanic trenches, such as the Puerto Rico trench, are long, narrow topographic depressions of the seabed. The deepest parts of the ocean floor, they define one of the most important natural boundaries on the Earth's solid surface: the one between two lithospheric plates.ceanic trenches, such as the Puerto Rico trench, are long, narrow topographic depressions of the seabed. The deepest parts of the ocean floor, they define one of the most important natural boundaries on the Earth's solid surface: the one between two lithospheric plates.