CH-358
Ozone layer
Chemistry · Secondary 3 · Medium · Ozone layer
CFC molecules released from old refrigerators reach the stratosphere, where they break down to form chlorine atoms. These chlorine atoms can destroy many ozone molecules before they are removed. What is the main reason the ozone layer recovers only slowly even after CFCs are banned?
- Existing CFCs persist for many years and keep destroying ozone
- Ozone is heavier than air and sinks back to Earth quickly
- Carbon dioxide emissions keep replacing the destroyed ozone
- The ozone layer cannot reform once any of it is destroyed
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