I go on a trip to the United States with the family by going out at Boulder Dam, I see a large concrete dams in the world. It was built to block the Colorado River. To prevent flooding in the winter for irrigation.And to produce electric power. This dam and water blocking in the vast areas into long lake to 115 miles, this lake was named Lake Mead (Lake. Mead) and I cruise the scenic beauty of the dam, and take a beautiful picture.
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