Topic 1: Foundation
Topic 2: Ecology
2.1 Individuals, populations, communities and ecosystems
2.2 Energy and biomass in ecosystems
2.3 Biogeochemical cycles
2.4 Climate and biomes
2.5 Zonation, succession and change in ecosystems
Topic 3: Conservation and biodiversity
Topic 4: Water
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 2.3 Biogeochemical cycles
2.3A Biogeochemical cycles
2.3B Carbon cycle
2.3C Carbon in lithosphere (HL)
2.3D Methane (HL)
2.3E Nitrogen cycle (HL)
