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If the earth did not have an atmosphere,...

If the earth did not have an atmosphere, would its average surface temperature be higher or lower than what it is now ?

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The lower layers of Earth.s atmosphere reflect infrared radiations from Earth back to the surface of Earth. Thus the heat radiation received by the earth from the Sun during the day are kept trapped by the atmosphere. If atmosphere of Earth were not there, its surface would become too cold to live.
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