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Assertion : The earth without its atmosphere would be inhospitably cold.
Reason : All heat would escape in the absence of atmosphere.
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Reason : All heat would escape in the absence of atmosphere.
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If both the assertion and reason are true and reason is a correct explanation of the assertion.
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.
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