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Wednesday, 16 January 2013

Important Questions for 9th

Chapter Natural resource
Importance of atmosphere for climate control on Earth
Importance of Ozone layer and causes for it's depletion
Processes involved in releasing and fixing of carbon dioxide and oxygen
Causes of air pollution , consequences  and effects .
More next time.......

old letter vector illustration Stock Photo - 11656593
 keep working hard  for better performance ....

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