Air ________ is caused by natural events such as volcanic eruptions and the burning of fossil fuels in vehicles and power plants.

Air ________ is caused by natural events such as volcanic eruptions and the burning of fossil fuels in vehicles and power plants.

• A. Pollution
• B. Smog
• C. Emissions
• D. Climate Change

Answer: (A)

Air pollution is the contamination of the air by substances that can harm health or the environment. It can come from natural events like volcanic eruptions, which release ash and gases, and from human activities such as burning fossil fuels in vehicles and power plants, which emit pollutants. Filling the blank with pollution fits because it describes the general condition of contaminated air produced by both natural sources and human activity. Smog is a specific type of polluted air formed under sunlight from various pollutants, emissions refers to the pollutants released rather than the state of the air, and climate change is a broad, long-term effect of many factors, not the immediate condition described here.

Air pollution is the contamination of the air by substances that can harm health or the environment. It can come from natural events like volcanic eruptions, which release ash and gases, and from human activities such as burning fossil fuels in vehicles and power plants, which emit pollutants. Filling the blank with pollution fits because it describes the general condition of contaminated air produced by both natural sources and human activity. Smog is a specific type of polluted air formed under sunlight from various pollutants, emissions refers to the pollutants released rather than the state of the air, and climate change is a broad, long-term effect of many factors, not the immediate condition described here.