Point source pollution involves pollutants entering water at specific locations, while nonpoint source pollution comes from dispersed sources. In this case, the sewage treatment plant releasing water into the river represents point source pollution.
Point source pollution occurs when pollutants enter water at a specific location such as a pipe or culvert from industries or sewage treatment plants. On the other hand, nonpoint source pollution results from multiple dispersed sources like runoff from residential areas or agricultural lands. In the scenario provided, the sewage treatment plant releasing cleaned water back into a river would be an example of point source pollution.
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