CALVIN LARSEN / SCIENCE PHOTO LIBRARY CALVIN LARSEN / SCIENCE PHOTO LIBRARY
Hoover Dam. Aerial view of the Hoover Dam, a hydroelectric power facility on the Colorado River, Nevada, USA. This dam produces 4 billion kilowatt-hours of power every year. Hydroelectric power harnesses the energy of flowing water. The dam traps water in a reservoir (upper right). The water is allowed to flow to the lower level (lower left) through turbines. This allows the water's kinetic energy to be converted into electricity.
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