Question

acid deposition effects
the effects of acid deposition usually appear over what time period?
within seconds
within minutes
within hours
very slowly over years

Explanation:

Acid deposition (acid rain, fog, etc.) causes gradual damage to ecosystems, buildings, and water bodies. The effects, like soil degradation, aquatic ecosystem collapse, or structural erosion, accumulate over long periods, not rapidly.

Answer:

very slowly over years