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If you just want the answer: 4 degrees Celsius If you want a bit of physics: Water is weird, when it freezes it expands. Which means that ice is less dense than water, in other words, the molecules must get further apart. At the bottom of the ocean, heaps of pressure pushes the water molecules together, this means that the water is unable to freeze. As many people know, water freezes at 0 degrees celsius. Therefore the water at the bottom of the ocean has a temperature above 0 degrees celsius. To go even further - water is the most dense at approximately 4 degrees Celsius and if the most dense water sinks (which it does) then the water at the bottom of the ocean must be approximately 4 degrees celsius.

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14y ago

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