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| rainout | |||
| acid rain | |||
| acid rain Rain having a pH less than 5.6. The acidity results from chemical reactions occurring when water, sulphur dioxide, and nitrogen oxides, generally released by industrial processes, are chemically transformed into sulphuric and nitric acids; rainout Process by which particles in the atmosphere act as centres round which water can form drops which then falls as rain; acid deposition; acidic precipitation; acid rain water | |||