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Fertilisers get washed off farm when it rains This leads to high levels of Nitrogen and Phosphorus in waterways.
Algal and Seaweed blooms (When algae forms in clumps on surface
Algal blooms block sunlight from the waterway
Plants begin to die because they cannot carry out photosynthesis
Dead plants are decomposed by cater and fungi (Produces Carbon Dioxide, reduces Oxygen)
No Oxygen available so animals die As they are decomposed, less Oxygen is available
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