What Causes an Ocean Trench to Form?

Answer

An ocean trench is a narrow topographic depression that is found in the ocean. Trenches are formed when two tectonic plates come together and the densest sinks below the other plate. The deep line that is formed as a result is an oceanic trench and it could extend for hundred of kilometres.
Q&A Related to "What Causes an Ocean Trench to Form"
The most basic requirement for the formation of trenches is the process of plate tectonics. While erosion and weathering are the primary agents for geological destruction, plate tectonics
http://www.ehow.com/info_8773410_required-ocean-tr...
plate tectonics.
http://wiki.answers.com/Q/Where_are_ocean_trenches...
A trench is formed where the oceanic plate dives below (is subducte...
http://www.chacha.com/question/how-is-an-ocean-tre...
movement of tectonic plates.
http://answers.yahoo.com/question/index?qid=200712...
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