How do most of the acids in acid precipitation form? A. Compounds found naturally in the atmosphere.
B. Methane deposits that are being released from permafrost.
C. Natural erosion of igneous rock.
D. Humans burning fossil fuels.

Since rain naturally has things dissolved in it, it will always be slightly acidic. However, when rain reacts with certain air pollutants, such as sulfur or nitrogen oxides, the water vapor converts into very diluted forms of sulfuric or nitric acids.

Explanation:

Since rain naturally has things dissolved in it, it will always be slightly acidic. However, when rain reacts with certain air pollutants, such as sulfur or nitrogen oxides, the water vapor converts into very diluted forms of sulfuric or nitric acids.