Niagara Falls is the ____ name for three waterfalls that straddle the international ____ between the ____ province of Ontario and the ____ state of New York. From ____o smallest, the ____ waterfalls are the Horseshoe Falls, the American Falls and the Bridal Veil Falls. ____ on the Niagara River, which drains Lake Erie into Lake Ontario, the combined falls form the highest flow rate of any waterfall in ____ America that has a vertical drop of ____ than ____. During peak daytime tourist hours, more ____ 168,000 ____ of water goes over the crest of the falls every ____. Horseshoe Falls is the most ____ waterfall in North America, as measured by flow rate.  Niagara Falls was formed when glaciers receded at the end of the Wisconsin glaciation (the last ice age), and water from the newly formed Great Lakes carved a path through the Niagara Escarpment en route to the Atlantic Ocean. Niagara Falls is famed both for its ____ and as a valuable source of ____ power. Balancing recreational, commercial, and ____ uses has been a challenge for the stewards of the falls since the ____ century.

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