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

Options

A. If both the assertion and reason are true and reason is correct explanation of the assertion .
B. If both the assertion and reason are true but reason is not a correct explanation of the assertion .
C. If the assertion is true but the reason is false.
D. If both assertion and reason are false.

Answer

A

Explanation

Heat radiated out by earth is reflected black 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 .