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KlappentextWhile you're traveling to the Grand Canyon, you may want to know some Grand Canyon For Kids Facts so you can get the most out of your trip. The canyon's formation dates back to at least 230 million years, so it is a very old place. In fact, the sediment that filled the canyon stopped gathering about 230 million years ago. However, it was not until John Wesley Powell surveyed the Colorado River that it was given its name.