The seven natural wonders of America. Part 3

The Great Lakes (Michigan, Wisconsin, Minnesota, and Ontario, Canada)
The Great Lakes (Lakes Superior, Michigan, Huron, Erie, and Ontario) form the largest system of fresh water on earth, containing 18% of the world's supply. Lake Superior is the largest and the deepest. It has the largest surface area of any freshwater lake in the world (81,000 sq. km) and holds enough water to cover the entire continents of North and South America with a third of a meter of water.

Glacier Bay (Alaska) 
Glacier Bay is a wilderness of mountains, glaciers, estuaries, beaches, and lakes which was covered by ice only 200 years ago The glaciers of Glacier Bay are still retreating, revealing new landscapes every few years. Glacier Bay is now a nature reserve and is used extensively for scientific research. 

Niagara Falls (New York State and Ontario, Canada) 
The Niagara Falls are formed where the Niagara River flows between Lake Erie and Lake Ontario. There are two main waterfalls: the Horseshoe Falls in Canada and the American Falls in the USA. The falls are 55 meters high, and 160,000 cubic meters of water flow over them every minute.


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