I found the answer to your question at
Niagara Falls a website about the history
of Niagara Falls.
It turns out that Niagara Falls was formed by a
river of water coming off of the melting glaciers
at the end of the Last Ice Age, 12,000 years ago.
Before that, the area that is now Niagara Falls
was not only dried up, but it was covered by
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