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At night, clouds act as a blanket by _____.

User DARKpRINCE
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Absorbing outgoing radiation 
User Ddiez
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Clouds can assist as an umbrella, protecting the earth's surface from incoming cosmic transmission which results in an overall cooling effect. To outgoing long wave transmission, however, clouds assimilate the energy, then release it again, but at their moderate temperature such as they emit lower energy than what they have received and hence act like a blanket by absorbing outgoing radiation.

User Tim Friedland
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