Niagara Falls is capable of producing over 4 million kilowatts of electricity, which is shared by the United States and Canada. Four of the five Great Lakes (Superior, Michigan, Huron, and Erie) drain into the Niagara River before emptying into Lake Ontario.
All lakes fill bowl-shaped depressions in the Earth's surface, called basins. Lake basins are formed in several ways. Many lakes, especially those in the Northern Hemisphere, were formed by glaciers that covered large areas of land during the most recent ice age, about 18,000 years ago.Sep 15, 2011
The Importance of Lakes. The Earth is called "the water planet" because it has approximately 14,108 cubic kilometers of water. ... Of these, lakes are the best "available freshwater source on the Earth's surface." Lakes are valued as water sources and for fishing, water transport, recreation, and tourism.