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I heard that Niagara Falls once dried up, is this true, if so when and what caused it to happen?
Answer 1:

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 glaciers.



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