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The Niagara Falls is a popular attraction for tourists. It is a group of three waterfalls between Canada and the US. They are more than 50 meters high.
The falls freeze in December. People can see thick ice on the top of the falls. It seems that the water does not move. It is not possible. The river is very strong. There is so much water that it can never freeze. Water still flows under the ice.
The falls freeze only once. Ice from Lake Eerie stops the river and it freezes. It cannot happen today. A special steel construction stops the ice. It does not get in the river.
That's cool!