Discussion
Which statement about acid deposition is FALSE?
Answer: C
Correct answer: It affects only the area near the source
This is the false statement. Sulphur and nitrogen oxides must first be oxidised to sulphuric and nitric acid, which takes hours to days, and the air mass travels throughout - so deposition typically occurs hundreds or even thousands of kilometres downwind.
The other three are true: catchment geology determines vulnerability through buffering capacity, mobilised aluminium is what damages fish, and the acids derive from sulphur and nitrogen oxides. The long transport is what made acid deposition an international problem requiring treaty negotiation.
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