why does a river water freeze only on the surface
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When water freezes, it gets less dense. That is why ice cubes float in a glass of water. It also takes a lot of energy removal to freeze water, and the air is usually much colder than the earth at the bottom of the lake. So the cold comes from the air above the lake, and starts freezing the water from thesurface.
hope it helps u dear (:
hope it helps u dear (:
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