Question 12
Which of the following is not a greenhouse gas?

(a) Methane
(b) Carbon dioxide
(c) Carbon monoxide
(d) Ammonia

(d) Ammonia

The primary greenhouse gases in Earth's atmosphere are water vapour, carbon dioxide, carbon monoxide, methane, nitrous oxide and ozone. Greenhouse gases absorb the infrared radiations and increase the temperature. Without greenhouse gases, the average temperature of Earth's surface would be about ${15}^{\circ }C\left({27}^{\circ }F\right)$ colder than the present average of ${14}^{\circ }C\left({57}^{\circ }F\right)$.