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On a night when the sky is clear, the temperature may dip considerably; on a cloudy night the temperature will usually dip much less. The reason for this difference is that | |
A. | the clear sky allows radiant energy to escape readily from the earth [Correct Answer] |
B. | on a cloudy night the clouds are warm and therefore retard the cooling [Wrong Answer] |
C. | the clear sky allows the cold of outer space to reach the earth [Wrong Answer] |
D. | current of air carry the heat away from the earth on a clear night [Wrong Answer] |