History of the Earth

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Across
  1. 1. Did humans and dinosaurs exist at the same time - yes or no
  2. 4. Cluster of stars
  3. 7. The name for the zone that describes the earth's special location in the solar system
  4. 12. Roughly how long ago the universe was created - five, fourteen, or twenty billion years
  5. 13. What the first mammal looked like
  6. 15. Scientists believed that asteroids brought this to earth
  7. 17. The name scientists gave to the beginning of the universe when it went "poof"
  8. 18. Last name of the scientist who discovered that the universe is expanding
Down
  1. 2. What the first single cell organisms emitted or let out through photosynthesis
  2. 3. The name of our galaxy
  3. 5. What hit the earth to create the moon
  4. 6. Which came first - fish or amphibians
  5. 8. How many billions of years it took for life to form on earth (write out the number)
  6. 9. Another name for our sun
  7. 10. What the early earth was full of
  8. 11. My favorite animal (it's orange and hairy - there's a stuffed version on the window sill)
  9. 14. Ms. Lafoon's first name
  10. 16. How many planets in our solar system (not including Pluto)