Consider the following statements about Earth’s atmosphere: I. Without the atmosphere, Earth’s temperature would be below freezing. II. The atmosphere traps heat to maintain average temperature. III. Gases like CO₂ absorb and trap radiation. Correct state

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Q: 51 (IAS/2025)
Consider the following statements about Earth’s atmosphere:
I. Without the atmosphere, Earth’s temperature would be below freezing.
II. The atmosphere traps heat to maintain average temperature.
III. Gases like CO₂ absorb and trap radiation.
Correct statements:

question_subject: 

Science

question_exam: 

IAS

All three statements about Earth's atmosphere are correct. Statement I is supported by the fact that without an atmosphere, Earth's temperature would be around -18°C, which is below freezing. Statement II is confirmed by the greenhouse effect, where Earth's atmosphere traps heat, maintaining a stable average temperature. Statement III is validated by the role of CO₂ and other greenhouse gases in absorbing and re-emitting infrared radiation, thus trapping heat in the atmosphere.