Answer: ozone layer.
- A ozone layer
- B troposphere
- C mesosphere
- D thermosphere
Correct answer: A. ozone layer
Explanation: The ozone layer absorbs most of the Sun’s ultraviolet radiation.
Sunlight passes through the atmosphere and warms the surface; the surface re-radiates this energy as infrared heat, which greenhouse gases (CO₂, CH₄, water vapour) absorb and trap - a naturally beneficial process that intensifies into global warming as gas concentrations rise from human activity.
Concept context
Pollution, global warming, ozone depletion, deforestation, and sustainability. Important for NEET and general awareness.