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The pelagic zone can be thought of in terms of an imaginary cylinder or water column that goes from the surface of the sea almost to the bottom. Conditions differ deeper in the water column; the pressure increases, the temperature drops and less light penetrates.he pelagic zone can be contrasted with the benthic and demersal zones at the bottom of the sea. The benthic zone is the ecological region at the very bottom of the sea.
Pelagic - An aquatic biome consisting of the open ocean, far from land, does not include sea bottom (benthic zone). Benthic - Referring to an animal that lives on or near the bottom of a body of water. Also, an aquatic biome consisting of the ocean bottom below the pelagic and coastal zones.