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Human influences on the environment

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4.15 Sewage Pollution
Understand the biological consequences of pollution of water by sewage including increases in the number of microorganisms causing depletion of oxygen
4.16 Eutrophication and fertilisers
Understand that eutrophication can result from leached minerals from fertilise

4.17 Deforestation
Understand the effects of deforestation, including leaching, soil erosion, disturbance of the water cycle and of the balance in atmospheric oxygen and carbon dioxide


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