Quote:
Originally posted by powerclown
Moving water seldom freezes, as well. Large bodies of water are usually in motion, currents and such. The faster its moving, the lower the temp at which it freezes. Something to do with Thermodynamics. 
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not really true--look inside a slurpee machine. the slurpee machine probably operates at slightly below 0 degrees celsius, to make up for the mechanical energy added to the system and for the fact that sugar water has a lower freezing point, but my guess is that it's not that much colder.
large bodies of water on this planet are usually salt water and therefore have lower freezing points. large bodies of water on this planet that are freshwater, such as lake michigan, will freeze later in the season than a small pond, but that's because the heat capacity of water is very high and it takes more days of below freezing temperatures before ice can form. and once a layer of ice forms on top, it insulates the water below, which can stay above freezing for a much longer time.