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How Do Waterfalls Freeze?

Water turns to ice when its molecules move slowly enough to form rigid bonds. Normally, the molecules in the waterfall move under the influence of both the flow and thermal agitation.

But if it gets cold enough, the heat effect becomes so low that not even the waterfall’s motion can stop ice forming, gradually at first but then ever more rapidly.

frozen-waterfalls

Waterfalls are commonly formed in the upper course of the river

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