Deep ocean
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The deep ocean is the lowest layer in the ocean, existing below the thermocline. The deep ocean is not well mixed, consists of horizontal layers of equal density, and is often as cold as -1 to 4 degrees Celsius (32 to 37 degrees Fahrenheit). 4 degrees Celsius is considered to be the most dense in terms of molecules per liter. Ninety percent of the total volume of Earth's oceans is found in the deep ocean.
See also: surface layer - salinity
