Questions: Semester Exam (Days 89 and 90) Marine Science Section 7 P C / semester Exam (Days 80 and 80 ) 25. What is a common source of nonpoint source pollution? factories mills refineries precipitation

The answer is the fourth one: precipitation.

Explanation for each option:

• Factories: These are typically considered point sources of pollution because they discharge pollutants from a single, identifiable source, such as a pipe or a smokestack.

• Mills: Similar to factories, mills are usually point sources of pollution, as they release pollutants from specific locations.

• Refineries: Like factories and mills, refineries are point sources of pollution due to their specific discharge points.

• Precipitation: This is a common source of nonpoint source pollution. Nonpoint source pollution comes from diffuse sources and is often carried by precipitation, such as rainwater runoff, which can pick up pollutants from various surfaces like roads, fields, and urban areas, and carry them into water bodies.

In summary, nonpoint source pollution is typically associated with diffuse sources like precipitation, which can transport pollutants over a wide area.