A) Prevent cold waves from the sky from descending on earth.
B) Reflect back the heat given off by earth
C) Produce heat and radiate it towards earth
D) Absorb heat from the atmosphere and send it towards earth.
Correct Answer: B
Solution :[b] Cloudy nights are warmer compared to clear cloudless nights because clouds act like blanket and reflect back the heat given off by the earth.
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