Acid deposition would most likely result in which of the following?

Acid deposition would most likely result in which of the following?

• A. The release of aluminum ions from soil
• B. Increase in soil pH
• C. Decrease in aluminum ions
• D. Reduction of mineral availability

Answer: (A)

Acid deposition lowers soil pH by increasing hydrogen ion concentration, which displaces cations on soil particle surfaces. This proton exchange causes aluminum that is bound to minerals to be released into soil water, raising the concentration of aluminum ions in the soil solution. That release is a direct result of the acidic conditions and is a primary concern because aluminum ions can be toxic to plant roots, hindering growth and nutrient uptake. The other options don’t fit as well: acid rain would not raise soil pH, aluminum ions would not decrease under these conditions, and while acidification can contribute to nutrient leaching, the most immediate and specific effect described here is the release of aluminum ions.

Acid deposition lowers soil pH by increasing hydrogen ion concentration, which displaces cations on soil particle surfaces. This proton exchange causes aluminum that is bound to minerals to be released into soil water, raising the concentration of aluminum ions in the soil solution. That release is a direct result of the acidic conditions and is a primary concern because aluminum ions can be toxic to plant roots, hindering growth and nutrient uptake. The other options don’t fit as well: acid rain would not raise soil pH, aluminum ions would not decrease under these conditions, and while acidification can contribute to nutrient leaching, the most immediate and specific effect described here is the release of aluminum ions.