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The water bodies such as river, ocean, lake are contaminated due to improper disposal of industrial and house hold wastes, is known as Water pollution. It affects plants and organisms living in these water bodies.
Water pollution can come from a number of different sources. If the pollution comes from a single source, such as an oil spill, called point-source pollution and if the pollution comes from many sources, it is called nonpoint-source pollution.
Most types of pollution affect the immediate area surrounding the source. Sometimes the pollution may affect the environment hundreds of miles away from the source, such as nuclear waste, this is called transboundary pollution.