IB ESS 4.1.4 Hydrological cycle flows
IB ESS 4.1.4 Hydrological cycle flows

IB Environmental Systems and Societies syllabusESS SL/HLFirst assessment 2026
Practise recognising water-cycle flows and calculating changes in infiltration, sediment flow or atmospheric inputs from figures.
How this is tested
- state water-cycle inputs to the atmosphere such as evaporation and transpiration
- calculate differences or percentage changes in hydrological data, including infiltration or sediment flow
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