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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.
In a cool climate (outside the ocean), the temperature can be below freezing, but in a really warm climate, this zone can have warm waters. The pelagic zone: -- This zone is generally a warm zone, however, because warm and cold currents are constantly mixing, it can be cold in some parts and cooler in others.The benthic zone: -- The temperature of this zone is colder than the pelagic zone and is pretty much always cold.The abyssal zone: -- This zone is the coldest of all of the zones.Because no sunlight reaches this zone the water is never heated.n a cool climate (outside the ocean), the temperature can be below freezing, but in a really warm climate, this zone can have warm waters. The pelagic zone: -- This zone is generally a warm zone, however, because warm and cold currents are constantly mixing, it can be cold in some parts and cooler in others.