Vocabulary

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Across
  1. 2. a scientist who studies Earth's history of life
  2. 6. layered sedimentary structures
  3. 8. fossilized feces, a dung stone
  4. 10. a fundamental geology principle stating that in undisturbed rock layers
  5. 13. a fossilization process where minerals from groundwater fill the empty spaces
  6. 15. the complete collection of all known fossils
  7. 16. a rock from animals in the past
  8. 18. a distinctive, abundant fossil that lived for a short period
  9. 19. sediments combine together
  10. 20. a geological replica of an organism
  11. 21. the geological process where organic material, like wood or bone, is gradually replaced by minerals
Down
  1. 1. Earth's chronological calendar, dividing its 4.6 billion-year history
  2. 3. a geological record of an organism
  3. 4. extinct marine mollusks
  4. 5. an underground tunnel or cavity dug by an animal for shelter
  5. 7. fungi that grow as multicellular filaments
  6. 9. the process of converting organic material into a carbon-rich residue
  7. 11. determining if something like a rock or fossil is older or younger
  8. 12. the specific numerical age of a rock, fossil, or artifact
  9. 14. one thing taking the place of another
  10. 17. fossilized plant exudate