Geological Time

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