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
Understand that eutrophication can result from leached minerals from fertilise
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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Add and subtract fractions to make exciting fraction concoctions following a recipe. There are four levels of difficulty: Easy, medium, hard and insane. Practice the basics of fraction addition and subtraction or challenge yourself with the insane level.
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