IB ESS 1.2.4 Types of flows
IB ESS 1.2.4 Types of flows

IB Environmental Systems and Societies syllabusESS SL/HLFirst assessment 2026
Practise recognising transfers and transformations of matter or energy in cycles, diagrams and farming or atmospheric system contexts.
How this is tested
- distinguish transfers from transformations using water or nitrogen-cycle processes
- identify diagram processes as movement between stores or a change of state, chemistry or energy
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