The Grand Canyon is a steep-sided canyon carved by the Colorado River in the United States in the state of Arizona. The Grand Canyon is a huge fissure in the Colorado Plateau that exposes uplifted Proterozoic and Paleozoic strata. The Grand Canyon is part of the Colorado River basin which has developed over the past 40 million years. A recent study places the origins of the canyon beginning about 17 million years ago.[wiki]

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