Acid rain is a rain that polluted by timbel and sulphure dioxide. Acid rain usually happen in industrial country.
In first stage, acid rain 's process are same with norml rain. Start by evaporation of water, then the steam gathered by wind and fall as rain when the amount is enough. But, when the rain fall, the water being contamined by timbel and sulphur dioxide from industrial waste. finally the water fall as acid rain.
Sumber : myself
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