Have you ever been to the Niagara Falls which is located between the border of Canada and the United States? I went there in 1994 when I visited my aunt who lives in Ontario, Canada. The Niagara Falls is about 120km from Toronto, Ontario. Water flowing from Lake Erie to Lake Ontario carved a gorge past the Niagara escarpment and over time, it has eroded the shale below the hard dolomitic rock at the top. More than six million cubic feet (168,000 m³) of water fall over the crest line every minute in high flow and almost 4 million cubic feet (110,000 m³) on average. It is the most powerful waterfall in North America. The water flows at the astonishing rate of 56.3 kph (35 mph). The falls are currently retreating at a rate of about 1m (3ft) a year.

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