1.2.6—Earth as integrated system
- Syllabus
- First assessment 2026
- Objective
- 1.2.6
- Level
- HL
Earth’s Spheres Work as One System
The biosphere, hydrosphere, cryosphere, geosphere, atmosphere and anthroposphere interact as one Earth system.
Trace a cross-sphere link and its feedback. The Gaia hypothesis is a model of linked life–environment regulation, not a claim that Earth is literally a conscious organism.
Fossil-fuel use in the anthroposphere raises atmospheric CO₂, changes temperature and can shrink cryosphere ice.
Atmosphere, cryosphere and hydrosphere; name the flow rather than treating spheres as containers.
Gaia is a feedback model, not proof that Earth has human-like consciousness.