Which of the following absorbs the insolation from the sun and preserves the earth's radiated heat, thus acting like a blanket allowing the earth neither to become too cold nor too hot?
A
Dust
B
Water vapour
C
Ozone
D
Nitrogen
Correct Answer: Water vapour
Water vapour absorbs parts of the insolation from sun and thus reduces its amount. It also preserves the earth's radiated heat. It thus acts like a blanket allowing the earth neither to become too cold nor too hot.