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Originally Posted by the_marq
Because that is where the cold air is, touching the top of the water. Heat is drawn out of the top layer of water first, therefore it freezes first. In time that layer of ice may even insulate the lower water from freezing.
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I don't think that is the right answer. It has more to do with the unique property of water. When it freezes it expands whereas most other things when they freeze contract. Ice is less dense than water so Ice can float on the surface...
This is particularyly useful in that if ice sank to the bottom, most of the life there would die... Many people point to this unique property as proof of intelligent design...