Multiple choice

A gas threatening Earth's ozone layer is:

  1. Sulfur dioxides

  2. chloroflurocarbons

  3. the greenhouse effect

  4. photochemical smog

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

Chlorofluorocarbons (CFCs) are chemical compounds that, when released into the atmosphere, break down and release chlorine atoms that destroy ozone molecules.