The Atmosphere

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Across
  1. 4. Common name for the atmosphere (3)
  2. 5. The process in plants that produces oxygen (14)
  3. 7. What 78% of the atmosphere is (8)
  4. 9. Made all the oxygen (6)
  5. 11. A hydrocarbon that is a greenhouse gas (7)
  6. 15. Tests for CO2 (9)
  7. 17. Science word for burning (10)
  8. 18. Made of two oxygens and a carbon(6,7)
Down
  1. 1. The Earth is 4.5 of these old (7,5)
  2. 2. Common name for H20 (5)
  3. 3. This is what causes climate change (9,6)
  4. 6. This star produces our light and heat
  5. 8. Makes up 21% of air (6)
  6. 10. Where the air pressure is measured from (3,5)
  7. 12. How high (in km) the atmosphere is (6)
  8. 13. Planet we live on (5)
  9. 14. A noble gas that makes up 0.9% of the atmosphere (5)
  10. 16. These probably produced the CO2 and nitrogen (9)