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Use this for questions related to the solid phase of Water ($\mathrm{H_2O}$).

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How does a river freeze when the water keeps moving?

When water freezes, it starts off small - thin membranes of ice, tiny grains, etc. But the water is constantly moving. Any paper-thin layer ice that could form would be broken apart immediately. … How can a large, moving, undulating river just freeze over without the ice breaking apart as it does so? …
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