Consider the following statements:
I. Without the atmosphere, temperature would be well below freezing point everywhere on the Earth’s surface.
II. Heat absorbed and trapped by the atmosphere maintains our planet’s average temperature.
III. Atmosphere’s gases, like carbon dioxide, are particularly good at absorbing and trapping radiation.
Which of the statements given above are correct?
- A.I and III only
- B.I and II only
- C.I, II and III
- D.II and III only
▶ Answer & Explanation
Correct answer: D. II and III only
The atmosphere acts as an insulating blanket, preventing extreme temperature fluctuations. Without it, the Earth would lose heat rapidly into space, leading to frigid temperatures, especially at night. Greenhouse gases like carbon dioxide are effective at absorbing and re-radiating infrared radiation, which is crucial for trapping heat and maintaining a habitable average global temperature.
Source: UPSC gs1 2025