The image shows the layers of the atmosphere, troposphere, tropopause, stratosphere, stratopause, mesosphere, mesopause, and hermosphere, with the altitude that each is. There is a space shuttle in the hermosphere.

6. Use this picture and the following web site to describe the characteristics of each of the atmospheric layers.

   http://liftoff.msfc.nasa.gov/academy/
   space/atmosphere.html

7. How does the atmosphere aid life on Earth?