Which term describes the dry deposition of acidic particles and moisture content?

• A. Acid rain
• B. Acid deposition
• C. Wet deposition
• D. Base deposition

Answer: (B)

Deposition is the process of pollutants from the air being transferred to surfaces on land or in water. When acids from air pollutants settle and transfer, the general term is acid deposition. It covers both the dry form, where acidic particles settle onto surfaces, and the wet form, where acids are delivered by rain, snow, or fog. So the overall term describing the dry deposition of acidic substances (and any moisture interaction) is acid deposition. Acid rain is specifically precipitation-based, wet deposition refers only to that precipitation route, and base deposition isn’t a standard term.