1 - 1From Pole to Pole Mar. 05, 2006
1 - 2Mountains Mar. 12, 2006
1 - 3Freshwater Mar. 19, 2006
1 - 4Caves Mar. 26, 2006
1 - 5Deserts Apr. 02, 2006
1 - 6Ice Worlds Nov. 05, 2006
1 - 7Great Plains Nov. 12, 2006
1 - 8Jungles Nov. 19, 2006
1 - 9Shallow Seas Nov. 26, 2006
1 - 10Seasonal Forests Dec. 03, 2006
1 - 11Ocean Deep Dec. 10, 2006
Planet Earth: 1x4
Caves
Although often overlooked, caves are remarkable habitats with bizarre wildlife. Explore the structures created inside the earth as well as the adaptations animals have made to thrive in these environments.
