Why Doesn't the Ocean Freeze?
In many parts of the world, winter temperatures drop low enough to make rivers and lakes freeze. And in those same parts of the world, where even those waters freeze, the ocean waters will not. Think about the pictures you’ve seen of the Arctic region. Most of the earth’s Arctic region is a frozen tundra, except the ocean. Why?
Is it because the water is always moving? Rivers move, yet they can still freeze (at least at the surface!). So what makes the ocean waters so different that at the subzero temperatures, they remain unfrozen?
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