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1.  What are the two main elements in our atmosphere and the approximate percentages of each?

2.  What changes occur to the air as one ascends into the atmosphere?

3.  Where does most of Earth's weather occur?

4.  What are the five principal layers of Earth's atmosphere?

5.  Answer BOTH of the following questions in the space below:

A)  In what layer of the atmosphere are most clouds found?

B)  What are the laws of gases that apply to the development of clouds?

6.  Why have the United States and several other countries studied Antarctic air masses in recent years?

7.  Answer BOTH of the following questions in the space below:

A)  What is the tropopause?

B)  Why is it so important to commercial aviation?

8.  What are some of the current studies concerning the jet stream, and why are these studies important?

9.  Why do modern commercial aircraft prefer to fly mostly in the stratosphere?

10.  What visual phenomenon occurs in the ionosphere over the polar regions?