Space Race and Science Review #4

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Across
  1. 3. she found the midocean ridge when she mapped out the ocean floor
  2. 8. when plate collide
  3. 9. stage of mitosis where the chromosomes meet in the middle
  4. 10. where the oldest rocks are on the bottom and the youngest are at the top
  5. 13. the trait you see
  6. 14. which came first?
  7. 15. first life forms on Earth that breathed carbon dioxide
  8. 16. the boundary where plates slide past each other
  9. 17. having two of the same genes
  10. 19. when rock layers make an arc
  11. 20. igneous rock that stays inside Earth
Down
  1. 1. process that makes identical cells
  2. 2. believed that the Earth had never changed since it was made
  3. 4. developed the idea of continental drif
  4. 5. heat up cool down in a fluid
  5. 6. the layer of Earth that is like silly putty
  6. 7. caused when the plates move
  7. 11. little packages of DNA that are only seen during cellular reproduction
  8. 12. the father of genetics
  9. 18. the amount of space an object takes up