solar radiation is immediately absorbed by carbon dioxide – Discussion Forum

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Piyush365

Asked: October 15, 2026In: Class 9 Science

Which of the following is primarily responsible for warming of the Earth? (i) Solar radiation is immediately absorbed by carbon dioxide, which then releases it as heat. (ii) The atmosphere’s tiny particles absorb incoming solar radiation, which directly heats the Earth. (iii) The Earth’s surface absorbs solar radiation, which is then re-radiated and trapped by greenhouse gases. (iv) The Earth’s environment is heated only by the solar radiation reflected by the clouds.

The correct option is (iii). Solar radiation penetrates the atmosphere and heats the ground, which then emits infrared radiation that is trapped by atmospheric greenhouse gases, sustaining global surface temperatures. CBSE Class 9 Science Chapter 13 Earth as a System: Energy, ...