Science PSSA Practice Test

"Pollution from multiple sources" specifically refers to nonpoint source pollution, which is characterized by the absence of a single, identifiable source. Instead, it arises from various sources that are often diffuse and spread over a large area. For example, rainwater can wash pollutants off agricultural fields, urban areas, and construction sites into nearby water bodies, contributing to water pollution in a collective manner.

This type of pollution typically includes runoff from fertilizers, pesticides, and sediments, which accumulate from numerous locations rather than discharging from a single outlet. This contrasts with point source pollution, which can be traced back to a specific source, such as a factory or sewage treatment plant. Understanding nonpoint source pollution is crucial for managing environmental health, as it often requires comprehensive strategies to control and mitigate its effects due to its widespread nature.