Discover the Wonders of Our Earth and the forces and life forms that shape our world with the Physical Geography Series. This program explores the Paleozoic Era from the Cambrian time - over 600 million years ago. It looks at common fossils found in the United States and investigates the origin of these animals and how Paleontologists have classified them according to their various characteristics. Student's will discover the fossils record, artists drawings and dioramas of life in the Cambrian, Ordovician, Silurian, Devonian, Mississippian, Pennsylvanian and Permian Periods. Discover plant life, marine life and land life including diatoms, algae, mosses, ferns, cycads, brachiopods, trilobites, crinoids, insects, reptiles, ammonites, sharks and fish. This program also discusses mass extinction theories and shows how the continents have moved.