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(a) Mention any two human activities whi...

(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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(a) (i) Burning of fossil fuels in vehicles,thermal plants and industries.
(ii) Particulate and gaseous emissions form industries, mining, processing and stone crushing.
(b) Earth's atmosphere is different from that of Venus and Mars. It contains only 0.03% carbon dioxide in addition to nitrogen, oxygen and water vapour. This is due to consistent presence of life on Earth (Gaia hypothesis). In comparison to Earth's atmoshpere, atmosphere of Venus and Mars is rich in `CO_(2)` (having 95 to 97% `CO_(2)`) and lifeless.
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