It is one of Gods great creations that is a must see and it was so awesome and when you go see it also because your just down the road where the meteor creator is as well as the petrifide garden is.
The largest canyon formation that was caused by erosion from the ocean as it receided over millions of years, and as ice age once was the glaciers melting ice broke up parts of the canyon the Colorado river Flow continues to this day still carving out deeper as it flows into the gulf of California
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