differentiate between (answer as per 9th class ICSE text book):
1. burning - respiration
2. oxidation - reduction
3. drying agent - dehydrating agent
give the sources and harmful effects on human beings , methods of control of the following:
1. global warming 2. acid rain 3.air pollution due to carbondioxide and sulphurdioxide
4.water pollution
1
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2012-10-03T07:23:16-0400
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