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Jan 12, 2011

Grand Canyon

Grand Canyon is a steep gorge carved by the Colorado River in the United States in the state of Arizona. This is largely contained within the Grand Canyon National Park, one of the first national parks in the United States. President Theodore Roosevelt was the main supporter of the preservation area of the Grand Canyon, and visited on numerous occasions to hunt and enjoy the scenery.

Grand Canyon is 277 miles (446 km) long, up to 18 miles (29 km) wide and reaches depths of more than one (1.83 km) miles (6000 feet) was nearly two billion years of earth's geological history. has been exposed as the Colorado River and its tributaries cut their channels through layer after layer of rock while the Colorado Plateau uplifted While certain geological processes and timing that make up the Grand Canyon. is the subject of debate by experts in geology, [3 recent evidence] shows the Colorado River through the canyon just established at least 17 million years ago. Since then, the Colorado River continues to erode and shape the canyon to the point we see it today.

Prior to European immigration, the area was inhabited by Native Americans who built settlements in the valley and many caves. Pueblo people considered the Grand Canyon ("Ongtupqa" in Hopi language), sacred sites and pilgrimages are made to it. The first Europeans known to have seen the Grand Canyon was García López de Cárdenas from Spain, who arrived in 1540.


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