Acid rain is primarily associated with which of the following?

Acid rain is primarily associated with which of the following?

• A. The burning of fossil fuels
• B. The burning of wood
• C. The release of aluminum ions from soil
• D. The use of solar energy

Answer: (A)

Acid rain forms when sulfur dioxide and nitrogen oxides rise into the atmosphere from burning fossil fuels, where they react with water and other chemicals to produce sulfuric and nitric acids. These acids then return to the surface in precipitation, lowering its pH. The burning of fossil fuels—coal and oil used in power plants, factories, and vehicles—produces these pollutants in much larger amounts than other sources, making fossil-fuel combustion the primary association with acid rain. Wood burning can contribute some pollutants, but it doesn’t dominate acid rain on a regional or global scale. Aluminum ions released from soil are a consequence of acid deposition affecting soil chemistry, not the source of the rain’s acidity, and solar energy use does not emit significant pollutants.

Acid rain forms when sulfur dioxide and nitrogen oxides rise into the atmosphere from burning fossil fuels, where they react with water and other chemicals to produce sulfuric and nitric acids. These acids then return to the surface in precipitation, lowering its pH. The burning of fossil fuels—coal and oil used in power plants, factories, and vehicles—produces these pollutants in much larger amounts than other sources, making fossil-fuel combustion the primary association with acid rain. Wood burning can contribute some pollutants, but it doesn’t dominate acid rain on a regional or global scale. Aluminum ions released from soil are a consequence of acid deposition affecting soil chemistry, not the source of the rain’s acidity, and solar energy use does not emit significant pollutants.