Answer:
chemical interaction
Explanation:
Acid rain is precipitation with the presence of sulfuric acid, nitric and nitrous acid, resulting from reactions and chemical interactions that occur in the atmosphere.
All rainfall is acidic, even in environments without pollution. However, rainfall becomes an environmental problem when its pH is below 4.5. They result from the exaggerated amount of fossil fuel combustion products released into the atmosphere as a result of human activities.
