Multiple choice

The type of molecule that is the major cause of the ozone hole and blocks the ozone cycle is 

  1. carbon dioxide

  2. chloroflurorocarbons

  3. oxygen

  4. carbon monoxide

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Chlorofluorocarbons (CFCs) are synthetic compounds that rise to the stratosphere and break down ozone molecules through catalytic reactions. This disrupts the natural ozone cycle and causes the ozone hole, particularly over Antarctica.