IB ESS 2.3.10 Ocean acidification
IB ESS 2.3.10 Ocean acidification

IB Environmental Systems and Societies syllabusESS SL/HLFirst assessment 2026
Practise linking dissolved carbon dioxide to ocean acidification and explaining impacts on shells, coral skeletons and marine food webs.
How this is tested
- explain how dissolved carbon dioxide lowers ocean pH
- link reduced pH to weaker calcium carbonate shells or coral skeletons
0 selected