Nitrates (from fertilisers) are washed out of the soil (leaching) and run into the water, Aquatic plants such as algae (on the surface) grow quickly, using the nitrates to build proteins. , Sunlight can no longer reach the plants on the bottom of the lake, The rate of photosynthesis decreases so the level of oxygen in the water decreases. , Plants and animals die, decomposers eat them and their respiration decreases oxygen levels further. .

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