Grand Canyon is a canyon cliff-steep, carved by the Colorado River, in northern Arizona. This canyon is one of the Seven Wonders of the World and mostly located in the Grand Canyon National Park, one of the first national parks in the United States. President Theodore Roosevelt is one of the main supporters of the Grand Canyon area, visiting on several occasions to hunt mountain lion and enjoy the incredible scenery.
This canyon, created by the Colorado River cutting a passage for millions of years, length of approximately 446 km, with width ranging from 6 to 29 km and with a depth of more than 1,600 m. Nearly than 2000 million years of Earth history has been truncated by the Colorado River and its tributaries layer after layer of sediment as the Colorado Plateau began to rise.
Grand Canyon was first seen by Europeans in 1540, García López de Cárdenas from Spain. The first scientific expedition to the canyon was led by U.S. Major John Wesley Powell in the late 1870s. Powell pointed to the sedimentary rocks exposed in the canyon as "leaves in a great story book. " However, long before that time, the region has been inhabited by Native Americans who built a residence in the walls of this canyon.
source : id.wikipedia.org
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