Acid rain is rain or any other form of precipitation that is unusually acidic, i.e. elevated levels of hydrogen ions (low pH).
PPT on Acid rain Can be Found on
http://pptsearchengine.in/pptsearchengine?q=ppt+on+acid+rain&page=1
http://www.filedigg.com/fileSearch?q=ppt+on+acid+rain&view_type=singleview&site=site&page=1&as_filetype=ppt
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