hadalpelagic zone

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The deepest part of the pelagic zone of the ocean, extending from a depth of 6000 m to the bottom of oceanic trenches up to 11 000 m below the surface. Conditions in the hadalpelagic zone are extreme. No sunlight penetrates, the temperature is a constant 4°C, and the pressure is 60–110 MPa. See ocean divisions.

Subjects: Ecology and Conservation.

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