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Water Pollution Activities carried out by the human population to supply food, power, and industrial needs have a considerable effect on the environment. These effects include atmospheric and water pollution, and destroying habitats. Water pollution is mainly caused by "run off", containing fertilisers, enters rivers from fields. It is known as leaching when the fertilisers get washed into the river or lake. Similarly, sewage also pollutes rivers. The polluting effects of fertilisers and sewage are caused by the constituent ions such as nitrates and phosphates. They result in eutrophication. Nitrates and phosphates enter the river and are absorbed by algae and other autotrophies. This causes them to grow rapidly at a much faster rate than usual. An algae bloom will then occur creating a blanket on the top of the water, this will block out the light and other plants on the bottom of the lake will die because they can't carry...

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