deep-sea trench

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Narrow, elongate, steep-sided and often rock-walled depression that is 3000m or more deeper than the adjacent deep-sea floor. Trenches are the deepest parts of the ocean, the greatest known depth being that of the Challenger Deep in the Marianas Trench where a depth of 11022 m has been recorded. Trenches usually mark the position of a destructive plate margin, where the sea floor is slowly being destroyed by subduction.

Subjects: Earth Sciences and Geography.

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