answers: Niagara River
context: erosive force of the Niagara River itself. The features that became Niagara Falls were created by the Wisconsin glaciation about 10,000 years ago. The same forces also created the North American Great Lakes and the Niagara River. All were dug by a continental ice sheet that drove through the area, deepening some river channels to form lakes, and damming others with debris. Scientists argue there is an old valley, St David's Buried Gorge, buried by glacial drift, at the approximate location of the present Welland Canal. When the ice melted, the upper Great Lakes emptied into the Niagara River, which </s> plan to remove the huge mound of talus deposited in 1954 was abandoned owing to cost, and in November 1969, the temporary dam was dynamited, restoring flow to the American Falls. Even after these undertakings, Luna Island, the small piece of land between the main waterfall and the Bridal Veil, remained off limits to the public for years owing to fears that it was unstable and could collapse into the gorge. Commercial interests have continued to encroach on the land surrounding the state park, including the construction of several tall buildings (most of them hotels) on the Canadian side. The </s> can flash flood and be torrential. Default is standard order from mouth to upstream: Cuyahoga River The Cuyahoga River ( , or ) is a river in the United States, located in Northeast Ohio, that feeds into Lake Erie. The river is famous for having been so polluted that it "caught fire" in 1969. The event helped to spur the environmental movement in the US. The name "Cuyahoga" is believed to mean "crooked river" from the Mohawk Indian name "Cayagaga", although the Senecas called it "Cuyohaga", or "place of the jawbone". The Cuyahoga watershed begins its journey in Hambden, Ohio,
question: where does the water at niagra falls come from