Across
- 5. mass disappearance of a species
- 8. fossil that has had all nutrients sucked out
- 9. record of geologic events
- 12. coldblooded animal
- 13. a well tested theory
- 21. drift of continents
- 24. period of time
- 25. person who studies fossils
- 26. evolving of an organism
- 27. lava rock
- 28. metro made of dust and ice
- 30. absolute number of years sense rock formed
- 32. where old rock meets new
Down
- 1. fossils found from one time period
- 2. the disappearance of an organism
- 3. length of time
- 4. lower the rock the older it is
- 6. half of time needed to decay atoms
- 7. the preserved remains of an organism
- 10. thin film of carbon on a rock
- 11. animal with back bone
- 13. hardened sediment
- 14. animal with out back bone
- 15. trace of an organism that has been fossilized
- 16. edge of earths plates
- 17. shape of animal
- 18. decay of radioactive elements
- 19. magma rock
- 20. guess at the age of a rock
- 22. pure substance
- 23. building block of life
- 29. a fossil from desolved organism
- 31. animal that lives in water and on land
- 33. warm blooded animal