1a4 marks
Ozone (O3) is a gas found in the stratosphere. Ozone depletion is caused by chlorofluorocarbons (CFCs).
Outline how ozone depletion occurs.
1b1 mark
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.
1c2 marks
State two impacts of ozone depletion.
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