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Sign in to saveupright=1.1|right|thumb|The Horseshoe Falls, Canada|Horseshoe Falls, one of the three Niagara Falls. The falls are a knickpoint, formed by slower erosion above the falls than below.
upright=1.1|right|thumb|The Horseshoe Falls, Canada|Horseshoe Falls, one of the three Niagara Falls. The falls are a knickpoint, formed by slower erosion above the falls than below.