What is in the air?

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Across
  1. 1. a process used by plants and algae to make sugar out of light, carbon dioxide, and water
  2. 4. a gaseous state of water; a variable gas that is found in earth's atmosphere
  3. 8. a colorless, odorless gas that makes up about 78 percent of earth's atmosphere
  4. 12. a radiant energy that heats
  5. 14. a gas in the atmosphere for which the relative amount stays constant
  6. 15. the amount of matter in an object or sample
Down
  1. 2. They are the most stable due to having the maximum number of valence electrons their outer shell can hold.
  2. 3. a water gas in the atmosphere; a greenhouse gas
  3. 5. the layer of gases surrounding earth
  4. 6. a form of oxygen that forms a thin layer in the stratosphere
  5. 7. a greenhouse gas in earth's atmosphere. carbon dioxide is created by natural and human-made process
  6. 9. a gas that absorbs and radiates energy in the atmosphere trapping thermal energy
  7. 10. an atmospheric gas whose amount changes based on the environment
  8. 11. the mixture of gases that surrounds the earth
  9. 13. a gas that makes up about 21 percent of earth's atmosphere