Wikipedia: Earth's Atmosphere
  Questions about the Atmosphere

1.  Why do we have layers in our atmosphere?



2.  Why is there less oxygen as you get closer to the sky?

3.  How many gases are there in the atmosphere?

4.  The crater is left unchanged for 3 million years.  How is that possible?  (Moon craters)



5.  How do the craters combine with Earth?



7.  Did Mt. St. helen volcano ash affect the whole world?


8.  Why is Mt. Everest the coldest?



9.  What is a radiosonde?
                


10.  How do we measure atmosphere in other ways besides radiosonde?

11.  What is photosynthesizing bacteria?

12.  How did the amount of oxygen in the atmopshere rise steadily from 0% about 2 biliion years ago to about 21 % today?