Q5. (a) Mention any two human activities which would be responsible for air pollution.
(b) How is Earth's atmosphere different from that of Venus and mars?
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Answer:The atmosphere of Earth contains a mixture of many gases like nitrogen (78.08%), oxygen (20.95%), carbon dioxide (0.03%) and water vapour (in varying proportion). On the other hand, the atmosphere on Venus and Mars mainly contains carbon dioxide, i.e., about 95-97%.
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Answer:
a) factories and industries
hope it is useful (i dont know the second one)
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