To finish this week's posts, we leave Europe and travel across the pond to Arizona and the Grand Canyon. There are many theories of how the Grand Canyon was formed, but the most prevailing one is erosion. The present day canyon is the result of nearly two billion years being exposed to water, ice and wind. Many geologists believe that the Colorado River established its course through the canyon at least 17 million years ago cut channels through layer after layer of rock while the Colorado Plateau was uplifted. I tried to keep this geological feat in mind when I composed this image of the Colorado River on the eastern end of the park. It is hard to believe that it could have formed such a dramatic landscape but I guess a lot can happen over 17 million years.