There is sometimes places in the textbooks that lie. Such as the Colorado carved the Grand Canyon over millions of years. Science has show, through the press, that you don't necessarily need a little water and a lot of time, but a lot of water and a little time. If they want to state these "new findings" they should be able to, which also needs an explanation of how the water got there (such as the Great Flood). Secondly, if you backed the water up in the Grand Canyon, if would all fill in above the Canyon's "water" line...creating a giant lake.