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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.
A deep ocean trench is a portion of the Earth's crust in which a tectonic plate is being subducted (pushed down) below another plate. At the border of the 2 plates there is a â¦ down turned portion of the uppermost plate along the uppermost edge of the subducting plate.hat is the deepest trench in the ocean and what ocean is it in? Mariana's Trench is the deepest trench in the world's oceans and it is found in the Pacific Ocean near Asia.