Answer :
Final answer:
The ocean zone located just above the floor of Challenger Deep in the Marianas trench is the Hadal zone.
Explanation:
The ocean zone located just above the floor of Challenger Deep in the Marianas trench is the Hadal zone. This zone is the deepest part of the ocean, characterized by extreme conditions such as high pressure and very low temperatures. It extends from the ocean floor down to depths of about 6,000 to 11,000 meters.
Learn more about the Marianas trench and ocean zones here:
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