give me the chapter water pollution with full details.
chapter number 20
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Water pollution is the contamination of water bodies, usually as a result of human activities. Water bodies include for example lakes, rivers, oceans, aquifers and groundwater. ... Point sources have one identifiable cause of the pollution, such as a storm drain, wastewater treatment plant or stream.,
The main problem caused by water pollution is that it kills organisms that depend on these water bodies. Dead fish, crabs, birds and sea gulls, dolphins, and many other animals often wind up on beaches, killed by pollutants in their habitat (living environment). Pollution disrupts the natural food chain as well.
Environmental pollution has many facets, and the resultant health risks include diseases in almost all organ systems
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