Environmental Science
The air temperature is 45o F, the wind is blowing at 30 MPH, and the wind chill temperature is 15o F. These conditions would be equivalent to:

A 30o F air temperature and 15 MPH winds
A 30o F air temperature and 45 MPH winds
A 15o F air temperature and 0 MPH winds
A 15o F air temperature and 30 MPH winds

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Environmental Science
The aurora is produced by:

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

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