Multiple choice general knowledge science & technology

One of the following does NOT cause depletion in Ozone layer. Which one is it?

  1. Human activities of using CFC, HCFC within air-conditioners or refrigerators

  2. Man-made climate change leading to unusual reduction in stratospheric temperature (while temperature nearer earth increases)

  3. Dumping of old refrigerators in the ground

  4. Volcanic eruptions leading to injection of hydrogen chloride (HCl) into the atmosphere
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

CFCs/HCFCs from refrigeration and climate change affecting stratospheric temperatures both cause ozone depletion. Dumping old refrigerators releases CFCs. Volcanic HCl DOES cause depletion but the question asks what does NOT cause depletion - this is a double negative trick question. All options except volcanic eruptions are anthropogenic, but volcanoes ARE natural ozone-depleting agents.

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