Obviously all of the ocean is above freezing; but reading about the titanic sub today, I still was surprised to read that it’s still above freezing down 2+ miles down. What keeps it relatively warm? Obviously there is some volcanic activity but it’s not widespread over the entire ocean is it?
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Firstly water is weird, as water freezes and turns solid it is less dense than as a liquid so floats on the liquid water, then water at 4 C is denser than water at cooler or warmer temperatures so it will sink to the bottom of a large body of water. https://youtu.be/J9PPLzUfz9E In addition the Sun isn’t the direct source for all of the heat on Earth the Earth itself is hot.
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