Video 1: Mechanism of The Seasons (5:59)
Video 2: Biomes (3:38)
Figure 1: Biomes
Video 3: Competition, Predation, and Symbiosis (3:19)
Video 4: How Greenhouse Gases Warm the Earth (3:40)
Figure 2: The Greenhouse Effect
Video 5: Studying CO2 (2:30)
Video 6: NASA | Exploring Ozone (2:20)
