It might seem that the constant rushing of water over a falls would keep it from freezing, but that isn't always the case. Check out the science behind the phenomenon of the frozen waterfall.
How do winter waterfalls freeze?
Top 11 Frozen Waterfalls in Iceland to Visit in Winter
The Frozen Falls
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Top 11 Frozen Waterfalls in Iceland to Visit in Winter
Forces of Nature, HowStuffWorks
Freeze
Freeze - レコーディング/PA機器
How waterfalls freeze mid-flow
A frozen waterfall in Bariloche, Patagonia, Argentina [1500x996] Photo by Guillermo Palavecino : r/EarthPorn
چگونه یک آبشار یخ می زند؟ - لاولی ساینس
US: 'Blizzard of the century' partially freezes Niagara Falls. See pics
The Mpemba Effect: Does Hot Water Really Freeze Faster Than Cold Water?
How Does A Waterfall Freeze? - CBS Minnesota