Environmental Science
This is used as a guide to planting and for determining the approximate date for harvesting crops:

Growing degree-days
Heating degree-days
Cooling degree-days
Mean annual temperature

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Environmental Science
Our seasons are caused by:

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

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Environmental Science
The albedo of the earth's surface is only about 4%, yet the combined albedo of the earth and the atmosphere is about 30%. Which set of conditions below best explains why this is so?

High albedo of clouds, high albedo of water
High albedo of clouds, low albedo of water
Low albedo of clouds, low albedo of water
Low albedo of clouds, high albedo of water

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