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This is a question which cannot be answered as the freezing point of anything depends on many characteristics, one of which for water is depth. As we know certain regions of the ocean are exceedingly deep while other regions are much less deep. The key to this is that water is at its most dense when at 4 degrees Celsius. That is to say that water at that temperature will be at the bottom of the lake/ocean. For the water to freeze the entire depth of the body of water must be at 4 degrees, then the top layer may cool down further and turn into a layer of ice. This can take a very very long time to occur, but indeed does in regions near the north and south poles. Constant temperatures at about -20 or -30 degrees can turn regions of the ocean into ice. Such cold temperatures are required because of the high salt concentration in the ocean as well as to get around this depth issue.

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8y ago
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15y ago

Seawater freezes at -2 deg C or 28.4 deg F.

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14y ago

but

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Q: What is the freezing point of oceans?
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