Environmental Science
The aurora is produced by:

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

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Environmental Science
Thermal belts are:

Pockets of warm air resting on a valley during the afternoon
Pockets of cold air resting on a valley floor at night
Warmer hillsides that are less likely to experience freezing conditions
Cold, below-freezing air found at the top of a mountain

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