You will need to log in to book media
Segment 1: Geologic Time (6 min.) Learn how absolute and relative times help scientists examine the Earth's age, as well as prehistoric life forms. Segment 2: Prehistoric Life (4 min.) Discover how fossils are formed and see the clues they give scientists to learn details about prehistoric life and the history of our planet. Segment 3: Events In Earth's Past (5 min.) Take a close look at the geological changes the Earth has undergone since birth more than 4 billion years ago. Segment 4: Dinosaurs and Fossils (5 min.)- See what scientists have learned about the dinosaur by studying fossils and rocks.