Environmental Science
Atmospheric ozone layer which protect us from UV-B and C is getting depleted most by addition of

carbon monoxide
sulpur dioxide
chlorofluorocarbon
carbon dioxide

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Environmental Science
The aurora is produced by:

Reflections of sunlight by polar ice fields
The combination of molecular and atomic oxygen to form ozone
Fast-moving charged particles colliding with air molecules
Scattering of sunlight in the upper atmosphere
Burning oxygen caused by the intense sunlight at high altitude

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