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  4. Assertion: The earth without its atmosphere would be inhospitably cold. Reason: All heat would escape in the absence of atmosphere.

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Q. Assertion : The earth without its atmosphere would be inhospitably cold.
Reason : All heat would escape in the absence of atmosphere.

AIIMSAIIMS 2002Gravitation

Solution:

Heat radiated out by earth is reflected back by the atmosphere. In the absence of atmosphere, all the heat will escape from earth’s surface which will make the earth inhospitably cold. The atmosphere helps in maintaining the temperature through convection of heat.