Environmental Science
The aurora is produced by:

Burning oxygen caused by the intense sunlight at high altitude
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

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Environmental Science
What is UNCED?

United Nations Conference on Environmental Day
United Nations Conference on Environment and Development
None of these
United Nations Conference on Education,

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