c r o s s w o r d p u z z l e

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Across
  1. 1. this layer of the atmosphere lies between the stratosphere& thermosphere
  2. 3. a chemical element; it has symbol N and atomic number 7.
  3. 4. the abbreviation for Chlorofluorocarbon.
  4. 8. arid land with usually sparse vegetation.
  5. 9. forest region which are exposed to warm and cold air masses.
  6. 10. gases in the earth's atmosphere that trap heat
  7. 12. a distinct geographical region with specific climate, vegetation, and animal life.
  8. 14. the hottest later of the Earth.
Down
  1. 2. the last layer of the Earth.
  2. 5. the range of weather conditions year round.
  3. 6. the weather on conditions on a day to day basis.
  4. 7. the lowest region of the atmosphere
  5. 11. the second-lowest layer of the atmosphere of Earth
  6. 13. three oxygen molecules.
  7. 15. a tropical or subtropical grassland.