Environmental Science
This is used as an index for fuel consumption:

Growing degree-days
Consumer price index
Mean annual temperature
Heating degree-days

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

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