Geological Puzzle

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Across
  1. 3. One of the first hominin fossils found
  2. 5. Process where elements break down
  3. 6. Used for short radioactive dating
  4. 7. Information about an organism's life
  5. 9. Formed when rocks lay on top of each other to form layers
  6. 10. Age of reptiles
  7. 11. Hard-shelled animals that lived in shallow seas
  8. 12. Age of Fish
  9. 14. The rate of radioactive decay
  10. 15. Formed when hot, molten rock crystallizes and solidifies
  11. 16. A theory of the creation of the universe
  12. 17. Formulated the theory of continental drift
  13. 18. Formed when rocks are subjected to high heat and high pressure
  14. 21. End of cretaceous, 65 MYA
  15. 23. When 50% of the species die out in a relatively short period of time
  16. 24. Age of mammals
Down
  1. 1. Single-celled organisms began
  2. 2. Early fish didn't have them
  3. 3. States that rocks on top are younger than rocks on the bottom
  4. 4. Used for long radioactive dating
  5. 8. First small dinosaurs appeared
  6. 13. Where new rock meets up with much older rocks
  7. 19. Only found on asteroids
  8. 20. 260 million years ago
  9. 22. 225 million years ago