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What is a long narrow but very deep depression in the ocean floor

User Mackworth
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Answer :Deep-sea trench, also called oceanic trench, any long, narrow, steep-sided depression in the ocean bottom in which occur the maximum oceanic depths, approximately 7,300 to more than 11,000 meters (24,000 to 36,000 feet). They typically form in locations where one tectonic plate subducts under another.

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User Firzen
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Mariana's trench? in specific, or trenches.
User Sarit
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