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deep-sea trench

 

Any long, narrow, steep-sided depression in the ocean bottom in which maximum oceanic depths (24,000 – 36,000 ft, or 7,000 – 11,000 m) occur. The deepest known depression of this kind is the Mariana Trench. Most trenches occur at subduction zones, where one tectonic plate is thrust under another.

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Britannica Concise Encyclopedia. Britannica Concise Encyclopedia. © 2006 Encyclopædia Britannica, Inc. All rights reserved.  Read more