Air pollution can be caused by natural events and human activities, including volcanic eruptions and the burning of fossil fuels.

Air pollution can be caused by natural events and human activities, including volcanic eruptions and the burning of fossil fuels.

• A. Natural events and human activities
• B. Natural events only
• C. Human activities only
• D. Neither

Answer: (A)

Air pollution comes from more than one type of source. Natural events can introduce pollutants into the atmosphere, such as volcanic eruptions that release ash and gases or wildfires that fill the air with smoke. At the same time, human activities—from burning fossil fuels in cars, power plants, and industries—produce pollutants like soot, sulfur dioxide, nitrogen oxides, and particulate matter. Because both natural events and human activities can cause pollution, the statement that air pollution can be caused by natural events and human activities captures all the relevant sources. If a choice suggested only natural events or only human activities, it would miss the other side of the picture. The idea that pollution could come from neither source is incorrect because evidence shows both contribute.

Air pollution comes from more than one type of source. Natural events can introduce pollutants into the atmosphere, such as volcanic eruptions that release ash and gases or wildfires that fill the air with smoke. At the same time, human activities—from burning fossil fuels in cars, power plants, and industries—produce pollutants like soot, sulfur dioxide, nitrogen oxides, and particulate matter. Because both natural events and human activities can cause pollution, the statement that air pollution can be caused by natural events and human activities captures all the relevant sources. If a choice suggested only natural events or only human activities, it would miss the other side of the picture. The idea that pollution could come from neither source is incorrect because evidence shows both contribute.