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Key Terms
Stratospheric ozone layer
Earth's natural _, absorbing harmful UV radiation in the upper atmosphere.
Tropospheric ozone
The 'bad' ozone found near the ground, acting as a _.
CFCs (Chlorofluorocarbons)
Human-made chemicals that release _ atoms in the stratosphere, destroying ozone.
Catalytic cycle
A process where a single chlorine atom can destroy _ of ozone molecules before being removed.
Montreal Protocol
A global treaty signed in _ that successfully phased out ozone-depleting substances (ODS).
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