Do You know Your Atmosphere?

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Across
  1. 2. The layer where meteors burn up
  2. 5. The layer where weather and clouds form
  3. 6. The outermost layer that gradually fades into space
  4. 7. The total number of satellites in a GPS constellation
  5. 11. What the Northern and Southern lights are know as
  6. 12. The layer where the International Space Station orbits
  7. 15. The layer where most commercial aircraft fly
Down
  1. 1. Used to study space and human anatomy
  2. 3. The boundary between the troposphere and stratosphere
  3. 4. Balloons, Used to observe weather
  4. 8. The planet surrounded by the atmosphere
  5. 9. Generally orbit in the exosphere
  6. 10. Line, Where space begins
  7. 12. The boundary between the thermosphere and exosphere
  8. 13. Responsible for warming the earth
  9. 14. Layer, Generally found in the Stratosphere to protect us from UV radiation