Water

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Across
  1. 1. H2O in the form of gas
  2. 3. The last layer of the atmosphere
  3. 7. The _____ is a thin layer that surrounds the Earth
  4. 8. The condition of Earth's atmosphere
  5. 9. Mass in the volume of air
  6. 11. This device measures air pressure
Down
  1. 2. This is a result of more air pollution
  2. 4. The second layer of the atmosphere
  3. 5. The first layer of the atmosphere
  4. 6. This molecule has 3 oxygen atoms
  5. 10. The _____ has the Aurora Borealis
  6. 12. The feeling of a column of air pressing down