17 marksmedium
4 marks
(a)
Ozone (O3) is a gas found in the stratosphere. Ozone depletion is caused by chlorofluorocarbons (CFCs).
Outline how ozone depletion occurs.
1 mark
(b)
In the 1970s, scientists Rowland and Molina proposed this main hypothesis:
‘CFCs will cause significant ozone depletion.
’ Explain why this hypothesis was not initially accepted by the scientific community.
2 marks
(c)
State two impacts of ozone depletion.