What is acid rain?
Acid rain is exactly what it says on the tin - rain that is acidic, i.e. of a pH less than 7. It is principally caused by the water containing desolved oxides of sulphur and nitrogen, which may come from rocks or from gasses released from humans (e.g. burning fossil fuels). The most common pollutant in this context is sulphur dioxide. Acud rain tends to have a value of 5.6 or lower on the pH scale above (in extreme cases it can be significantly lower than this).
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