Paleontology Crossword Puzzle

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Across
  1. 1. A way in which organisms are fossilized and preserved in sticky tree sap
  2. 3. The death of every member of a species
  3. 9. A unit of geologic time that includes two or more periods
  4. 10. A type of fossil that forms when sediments fill in the cavity left by a decomposed organism
  5. 16. What happens when organisms produce offspring by a sexual or asexual process
  6. 18. The current era "Age of Mammals"
  7. 20. An event that happens suddenly
  8. 24. The process whereby organisms who are better adapted to their environment tend to survive and produce more offspring
  9. 25. Things or events that evoke a specific functional reaction in an organ or tissue
  10. 26. Principle that states that sediments will be deposited in horizontal layers
  11. 27. A trace or remains of organisms that lived long ago
  12. 28. Process in which minerals replace an organism's tissues
  13. 29. A species, family, or other larger group that have no living members
  14. 30. Any method of measuring the age of an event or object in years
Down
  1. 1. The origin or background of something
  2. 2. A fossilized mark that show activity or movement of an animal
  3. 4. The study of the origin, history, and structure of the earth
  4. 5. Supercontinent
  5. 6. Refers to the variety and variability of life on Earth
  6. 7. A unit of geologic time in which eras are divided
  7. 8. The principle that states that younger rocks lie above older rock if the layers have not been disturbed
  8. 11. A group of living organisms consisting of similar individuals capable of exchanging genes or interbreeding.
  9. 12. The gradual development of something, especially from a simple to a more complex form
  10. 13. A person who studies fossils
  11. 14. The action or process of classifying something according to their shared qualities or characteristics:
  12. 15. A mark or cavity made in sedimentary rock by a shell or other body parts
  13. 17. pits asphalt A way in which organisms have been fossilized by being trapped and preserved in sticky thick pool
  14. 19. The standard method used to divide the Earth's long natural history into manageable parts
  15. 21. A fossil that is found in rock layers from only one geologic age and is used to establish the age of the rock
  16. 22. A principle that states that the geologic processes that occurred in the past are the same geologic processes that occur today
  17. 23. Any method of determining whether an event or object is older or younger than another