Which of the following describes nonpoint-source pollution?

Nonpoint-source pollution refers to contaminants that originate from numerous, often dispersed sources rather than a single, identifiable location. This type of pollution is typically difficult to pinpoint because it results from cumulative runoff from various landscapes, such as agricultural areas, urban environments, and forests. Rainwater or melting snow can carry pollutants like fertilizers, pesticides, oil, and sediments from these dispersed sources into water bodies.

In contrast, pollution from a single location would be classified as point-source pollution, which is much easier to control and regulate since it can be traced back to a specific site. Nonpoint-source pollution, however, poses a greater challenge for monitoring and management due to its diffuse nature. Additionally, this type of pollution can impact not only freshwater bodies but also coastal and marine environments, making it a widespread environmental concern. The complexities involved in measuring and controlling nonpoint-source pollution highlight its distinction from other types of pollution.