Point-source pollution is easy to see because it comes from one specific spot. Nonpoint-source pollution is trickier because it comes from lots of different places all at the same time.
Rephrase in a 3rd graders response
Point-source pollution is easy to identify. As the name suggests, it comes from a single place. Nonpoint-source pollution is harder to identify and harder to address. It is pollution that comes from many places, all at once.
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