ocean trench

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A deep, linear valley on the ocean floor, which runs parallel to the coast, and marks an active subduction zone at the margins of one of the continents, where one crustal plate is pushed down beneath another at a destructive plate boundary. The deepest known ocean trench is the Marianas Trench in the Pacific Ocean, which is 11 033 metres below sea level.

Subjects: Environmental Science — Earth Sciences and Geography.

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