Environmental Science
The lowest temperature that can be attained by evaporating water into the air is known as the:

Frost point
Minimum temperature
Heat index
Wet-bulb temperature
Wind chill temperature

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Environmental Science
The aurora is produced by:

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

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