Q9 of 287 Page 362

What is the major component of atmosphere of Earth and Mars/Venus ?

● Major component of atmosphere of Earth is nitrogen 79% and oxygen 20%, small fraction of carbon dioxide and other gases.


● Atmosphere of Venus and Mars is composed mainly of carbon dioxide ranging from 95-97%.


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Define atmosphere.

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Name two planets other than Earth which also have an atmosphere.

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Narne the region of atmosphere where (a) ozone layer is present (b) Most of the atmospheric gases are present.

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What percentage of carbon dioxide is present in the atmosphere?