Answer: ozone layer.
- A ozone layer
- B world’s rivers
- C tropical forests
- D open oceans
Correct answer: A. ozone layer
Explanation: The Montreal Protocol phased out ozone-depleting substances such as CFCs.
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.