air and atmosphere

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Across
  1. 3. makes up 0.04% of the Earth's atmosphere.
  2. 4. removes carbon dioxide from atmosphere.
  3. 6. comes from the decaying o plant and animal matter.
  4. 10. pollution may cause health problem to living organisms.
  5. 12. releases water vapor to the atmosphere.
  6. 13. cycle is the mechanism that maintains the level of carbon dioxide in the air.
  7. 14. is caused by the greenhouse gases.
  8. 15. gases are gases that trap radiation.
Down
  1. 1. is a layer that surrounds the Earth.
  2. 2. removes water vapor from the air
  3. 5. makes up 21% of the earth's atmosphere.
  4. 7. Which noble gas has the highest percentage in air?
  5. 8. formed when acidic air pollutants (sulfur dioxide and nitrogen dioxide) react with water in the atmosphere
  6. 9. makes up 78% of the Earth's atmosphere.
  7. 11. forms photochemical smog, which irritates the eyes and lungs and causes breathing difficulties.