History of the Earth (4.6-2.5bya)

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Across
  1. 3. the _____ galaxy contains our solar system and 3,200+ other planetary systems
  2. 4. all space, time, matter, galaxies, solar systems
  3. 6. Dioxide SO2
  4. 9. Water in the state of gas (not liquid)
  5. 11. NH3
  6. 13. this theory describes the origin (start) of the universe
  7. 14. Early Earth's atmosphere did not have this gas at first
  8. 16. CH3
Down
  1. 1. ____ System: sun + 8 planets
  2. 2. Earth eventually cooled down due to the oxygen gas made by a tiny single celled, blue-green algae like living thing called, ___________
  3. 5. the _____ soup is a liquidy mixture of carbon, hydrogen, nitrogen that was struck with lightning that may have made the ingredients for the first living thing
  4. 7. the temperature of Early Earth was really ____
  5. 8. CO2
  6. 10. the ___ layer is a layer of oxygen that was made because cyanobacteria started to put out oxygen
  7. 12. this could be the result of space solids like big asteroids crashing into each other
  8. 15. the first living thing was not a plant or animal, it was a very simple single ______