Question

what have the scientific studies identified as the major cause of acid rain in the united states?
a. burning of fossil fuels that release sulfur and nitrogen compounds into the air
b. volcanic ash in the air
c. excess solar radiation due to the depletion of the ozone layer
d. chemicals still in the atmosphere from the asteroid collision with the earth

Explanation:

Acid rain forms when sulfur dioxide (SO₂) and nitrogen oxides (NOₓ) react with water in the atmosphere. Burning fossil fuels (e.g., coal, oil) for energy is the primary human-made source of these compounds in the U.S. Volcanic ash (B) and asteroid collision chemicals (D) are minor/natural sources, while ozone depletion (C) relates to UV radiation, not acid rain.

Answer:

A. burning of fossil fuels that release sulfur and nitrogen compounds into the air