Geological Time

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Across
  1. 3. An extremely thin coat of carbon on a rock
  2. 5. All atoms are the same
  3. 7. Gradual changes in living things over long periods of time
  4. 8. Eras are subdivided into unit in geological time
  5. 9. New rock layers meet a much older rock surface beneath them
  6. 10. continents moving slowly over earths surface because of forces inside earth
  7. 15. Hollow ares in sediment in the shape of an organism
  8. 20. Number of year since rock formed
Down
  1. 1. A break in earth crust
  2. 2. Scientists who study fossil
  3. 4. Fossil in which minerals replace all or some parts of an organism
  4. 6. All matter, tiny particles
  5. 11. Earth cooled; during the Quaternary Period
  6. 12. If ti no longer exists and will never live again on earth
  7. 13. Another name for the Mesozoic Era
  8. 14. Rock's age compared with the other rock's age
  9. 16. Group of hard-shelled animals that evoled in shallow sea more then 500 mya
  10. 17. Preserved remains or traces of living things
  11. 18. Continents moved into a great landmass
  12. 19. Solid copy of the shapes organism