What formed the grand canyon
None of the above, it was the Colorado River and millions of years...
i'm not sure if this is it but i think there was a lot of water or a river at one point and that made the canyon.
Grand Canyon was formed by the erosive activity of the Colorado River. Other things that took place during this formation include change in the Colorado River course, volcanism, continental drift, and the Earth's orbit. Go to http://www.buzzle.com/articles/how-was-the-grand-canyon-formed.html for more information.
The Indians built it