Topic 1: Foundation
Topic 2: Ecology
Topic 3: Conservation and biodiversity
Topic 4: Water
4.1 Water systems
4.2 Water access, use and security
4.3 Aquatic food production systems
4.4 Water pollution
Topic 5: Land
Topic 6: Atmosphere and climate change
Topic 7: Natural resources
Topic 8: Human populations and urban systems
HL lenses
View a summary cheatsheet for 4.4 Water pollution
4.4A Water pollution
4.4B Water quality
4.4C Eutrophication
4.4D Pollutants in water (HL)
4.4E Algal blooms and anoxic/hypoxic waters (HL)
4.4F Sewage treatment (HL)
4.4G Water quality management (HL)
