The Atmosphere

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Across
  1. 4. air in this layer is very hot and thin
  2. 7. gases in the atmosphere keep the planet ____
  3. 8. each layer has its own ______
  4. 9. layer that contains ozone gas
  5. 11. water _____ and rises into the atmosphere
  6. 14. the atmosphere provides essential ___ for living things
  7. 15. about 20% of the atmosphere is made up of this gas
  8. 16. most abundant gas
Down
  1. 1. lowest layer
  2. 2. ____ can be trapped in the atmosphere and keep the air clean
  3. 3. helps____ air and water around the world
  4. 5. layer that is very cold
  5. 6. outermost layer of the atmosphere
  6. 7. the atmosphere supports the ___ ___
  7. 10. the atmosphere protects us from harmful _____
  8. 12. caused by uneven heating of the atmosphere by the sun
  9. 13. Earth's atmosphere is made of ___ different gases