Question

acid rain is caused by which of the following?

nitrogen compounds in the air
deforestation
nitrogen compounds in the soil
excess carbon dioxide

Explanation:

Acid rain is formed when pollutants like nitrogen oxides (from nitrogen compounds in the air, e.g., from vehicle emissions and industrial processes) react with water vapor in the atmosphere. Deforestation mainly affects soil erosion, biodiversity, and the carbon cycle. Nitrogen compounds in the soil don't directly contribute to acid - rain formation as they are not in the gaseous state to react in the atmosphere. Excess carbon dioxide mainly contributes to global warming, not acid rain (though in very small amounts it can make rain slightly acidic, but not to the level of acid rain which is mainly due to sulfur and nitrogen oxides).

Answer:

nitrogen compounds in the air