Paleobiology Crossword Puzzle

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Across
  1. 5. A fossil of a footprint
  2. 7. A break in a time period
  3. 8. A geological feature that disrupts another feature
  4. 13. a long, distinct period of history
  5. 14. A non- living organism that shapes its environment
  6. 15. A large lake used as a water supply
  7. 16. The time taken for radioactivity
  8. 17. The earliest era of geological history
  9. 21. a period of time in history or a person's life, typically one marked by notable events or particular characteristics.
  10. 23. A fossil that is good to use to date things
  11. 24. When a species dies out quickly
  12. 25. An interval of history that has distinct patterns
Down
  1. 1. A rule to help scientists to determine the relative age of layers
  2. 2. The idea that Earth has always changed in uniform ways
  3. 3. a process in which different organisms evolve and change
  4. 4. The process in which organisms use sunlight to synthesize/ grow
  5. 6. A method of dating geological specimens
  6. 9. The process of flowing
  7. 10. The age of a rock layer compared to another
  8. 11. The process in which organisms use inorganic chemicals to grow (often includes an absence of sunlight)
  9. 12. A series of different layers of rocks
  10. 18. the numeric age of fossils
  11. 19. A living organism that shapes its environment
  12. 20. A remnant of an organism
  13. 22. A branch of education that specializes in fossils