What is in the Air?

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Across
  1. 2. This is 78% of the earth's atmosphere
  2. 6. The layer of gases that surrounds a planet or star
  3. 8. This is 21% of the earth's atmosphere
  4. 12. A gas in the ATM for which the relative amount stays the same
  5. 13. An atmospheric gas whose amount changes based on the environment
  6. 15. This is a variable gas that is increasing in concentration in the ATM
Down
  1. 1. This traps thermal energy
  2. 3. This is radiant energy that heats
  3. 4. This is a process used by plants and algae to make sugar/food out of light, co2, and water
  4. 5. This is 0.04% of the earth's atmosphere
  5. 7. This is the most abundant variable gas
  6. 9. A form of oxygen that forms a thin layer in the stratosphere
  7. 10. The amount of matter in an object or sample
  8. 11. This doesn't react easily with other substances
  9. 14. This is mostly nitrogen, and oxygen with some argon, carbon dioxide, ozone, water vapor, and some other gases