PETER MATULAVICH / SCIENCE PHOTO LIBRARY PETER MATULAVICH / SCIENCE PHOTO LIBRARY
View of Niagara Falls, with 30-meter high American Falls in the foreground and the skyline of Niagara Falls, Canada in the background. Niagara Falls are three separate water falls that straddle the international border between the U.S. and Canada. They were created during the Wisconsin glaciation about 10,000 years ago by forces that also created the Great Lakes and the Niagara River. The falls are a major tourist attraction today and a valuable source of hydroelectric power.
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