Home India and World Geography MCQs

Question

Which of the following is a primary cause of ozone depletion in the stratosphere?

  1. Increased carbon dioxide emissions
  2. Release of chlorofluorocarbons (CFCs)
  3. Deforestation and soil erosion
  4. Volcanic eruptions

Answer:

Option B: Release of chlorofluorocarbons (CFCs)

Detailed Solution:

The correct answer is “Release of chlorofluorocarbons (CFCs)”.

Chlorofluorocarbons (CFCs) are the primary cause of ozone depletion. When released into the atmosphere, CFCs rise to the stratosphere where they are broken down by UV radiation, releasing chlorine atoms that catalyze the destruction of ozone molecules.