Which of the following is a common source of nitric oxide in the atmosphere?
Forest fires
Human activities, such as combustion of fossil fuels
Volcanic eruptions
All of the above
Nitric oxide (NO) is a precursor to nitric acid and is a common source of nitric acid in the atmosphere. Nitric oxide can be produced by forest fires, lightning, and human activities such as combustion of fossil fuels. Volcanic eruptions can also release large amounts of nitric oxide into the atmosphere.