Environmental Science
Nitrogen gas returns to the atmosphere by the action of

Denitrifying bacteria
Nitrate fertilizers
Nitrifying bacteria
Nitrogen fixing bacteria

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Environmental Science
Assuming that the night will remain clear, calm, and unsaturated, the predicted minimum temperature is 32oF. Suddenly the wind speed increases and remains gusty throughout the night. The minimum temperature will most likely be:

Higher than predicted due to mixing
Higher than predicted due to the release of latent heat
Much lower than predicted due to radiational cooling
About the same as predicted but will occur earlier in the night

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Environmental Science
Our seasons are caused by:

The angle at which sunlight reaches the earth
Only (b) and (c) are correct
All of these
The length of the daylight hours
The changing distance between the earth and the sun

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Environmental Science
The earth is tilted at an angle of 23.5o with respect to the plane of its orbit around the sun. If the amount of tilt were increased to 40o, we would expect in middle latitudes:

Cooler summers and milder winters than at present
Hotter summers and milder winters than at present
Hotter summers and colder winters than at present
No appreciable change from present conditions
Cooler summers and colder winters than at present

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