The document discusses ecosystems, food chains, and water resources. It defines key terms like ecosystem, producers, consumers, and watershed. It explains how living things interact through food chains and how human activities can pollute water resources and disrupt ecosystems. Specifically, it notes that stormwater runoff is a major cause of nonpoint source pollution that upsets food chains and ecosystems. The document emphasizes the importance of conserving and managing natural resources like water.

1. Understanding Our Local Watersheds and Our Local Water Resources

12. Nonpoint Source Pollution

13. Point Source Pollution Factory Smoke Stack Jet Engine Oil Refinery

19. The Water Cycle