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Why Is The Temperature Needed To Freeze Ocean Water Lower Than The Temperature Needed To Freeze The Surface Of A Freshwater Lake?

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The ocean has salt in it.  Salt has a lower specific heat (The amount of heat required to raise the temperature of one gram of a substance by one Celsius degree)
than water, so adding salt to water lowers the specific heat of the entire mixture.

If you live in an area that receives snow or ice in the winter, notice how people spread rock salt on the ground to help melt the ice.  The same goes for the ocean; salt water freezes slower because of the salt.

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