An elementary exploration of canyons, focusing on the geological evidence that helps explain how and where they form and spotlighting famous examples, such as Arizona s Grand Canyon.

Petrie is having a difficult time preparing for "the day of the flyers" a very important day for all the flying residents of the Great Valley. The young flyers must participate in a very precise flying exhibition to prove they are ready to fly with the adults. Always nervous when flying, Petrie has even more trouble flying with his siblings in precise group formations. At the same time, a newcomer has Littlefoot and his friends trying to help him...