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B
Infrared light reaching the earth
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C
Moisture layer in the atmosphere
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D
CO2 layer in the atmosphere
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Solution
The correct option is C CO2 layer in the atmosphere The gases which are transparent to solar radiation but retain and partially reflect back long-wave heat radiations are called greenhouse gases. Greenhouse gases are essential for keeping the earth warm and hospitable. The various greenhouse gases are carbon dioxide (warming effect 60%), methane (warming effect 20%), chlorofluorocarbons or CFCs (warming effect 14 percent) and nitrous oxide (warming effect 6 percent). Other gases of minor importance are water vapour and ozone.