Answers

2014-11-03T23:39:58+05:30
Coal and petroleum are non renewable sources.. Once they are used up it takes millions of millions of years for them to be formed again.Hence they should be used judiciously
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Thnx for answering
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2014-11-03T23:53:15+05:30
Coal and petroleum take millions of years to form. So they should be used judiciously.
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