• To freeze many more hydrogen bonds have to be made between the water molecules making it solid. If the water is moving then these bonds cannot be made or are broken instantly as independently each one is very weak. The force of the water overcomes the bonds easily. So the molecules remain free moving.
  • Well they do, it is not something that happens much in Britain but in some countries it does . You can find stories about people skating on the Thames, in earlier centuries. So even in Britain it used to get that cold.Artists have even painted pictures of the skaters
  • I thought this was interesting: "Kinetic energy is certainly a factor in how rivers freeze. Ambient air temperature is another. Rivers begin freezing at the banks, in pools or eddies. As the ice sheets there grow out into the water, they break off and float downstream. Along with the colder weather both at your location and at the head of the river, this has the effect of cooling the water, regardless of its speed, to near freezing. This accelerates the growth and thickening of ice near the bank, allowing it to reach farther into the moving water, and it also allows any unmelted floes to grow. Most rivers have shallow regions or islands, and floes can become grounded on these. As the floes ground, they provide not only seeds for more stationary ice to form, but blockages which catch other loose ice. Eventually the river surface freezes completely."
  • it mite be because that it is constantly moving and all the currents at the bottom warm up the river so it doesn't ice over
  • Rivers DO freeze, if it's cold enough for long enough. Lakes freeze as well, as does the ocean in very cold places such as Antarctica or the Arctic circle in the north.
  • theyre always moving!
  • Moving water does freeze. There were recorded episodes when even Niagra Falls froze.
  • A river is in my backyard. I am looking out my window now (2/1/07) and see that it is presently frozen solid.
  • Here is a link with a pic of a frozen waterfall in Canada I believe the speed in which it takes to freeze depends on the depth and volume of water.
  • Also, pressure can keep water from freezing or evaporating. That is why in the boilers of power plants, water is pressurized to keep the boiler from exploding.
  • This is a picture of the Madison river in Montana. The Madison flows from Yellowstone Park. As you can see, this river freezes almost every year. When it gets below 0 degrees for awhile, and strong winds, combined creates this frozen river. It is said that this river is one of only a few in the world, that freezes from the bottom up.
  • moving water does freeze ... moving water just requires more cold temps to exceed the river's kinetic energy ... LoLz ... ^_^
  • water freezes noo get outta here!
  • moving water does freeze. if it is cold enough, long enough. the niagara falls, which have a volume of 4 million cubic feet of water per minute over the crest, has been known to freeze solid. that's alota watta...
  • Moving water has energy, as the water starts to freeze it will tend to slow and the energy in the flow will be turned into heat energy enough to keep from freezing. If you put a thermometer in the flow, it will maintain at just about 32 degrees F.
  • best educational website
  • It does. Or at least if it gets cold enough it does.

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