What is in the air?

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Across
  1. 2. gashumansexhale
  2. 4. changesinresponsetoactivitiesinenvironment
  3. 5. plantsturnsunlightintofood
  4. 6. 2ndmostabundantgasinatmospher
  5. 8. shields earth from extreme temperatures
  6. 10. agasthatabsorbsultravioletradiation
  7. 12. fogandraincloudsareexamples
  8. 13. agaswhichdoesn'treacteasilywithothersubstances
  9. 14. variablegascausedbycowfarts
Down
  1. 1. heat
  2. 3. how much matter is in something
  3. 7. trapsheatintheatmosphere
  4. 9. amount doesn't change
  5. 11. most abundant gas
  6. 15. can't see, touch or taste it