Have you ever visited the Grand Canyon? As one of the world’s seven wonders, millions of people have visited this landmark. Have you ever wondered how it was formed? Learn how the 3 "R"s- Rock, Rivers, & Erosion, have led to the formation of the Grand Canyon and the changes it undergoes in present day. Discover whether how the canyon will continue to grow and change in the future. This lesson in geology gives insight to the phenomena that has created one of the Earth's greatest landmarks.