Across
- 6. fossils give us a history of changing ____
- 8. process today is the same as the past
- 10. type of rock fossils are found in
- 11. hardened tree sap
- 13. type of fossils that is a 3D mold
- 14. type of fossil that is widely distributed and good for dating
- 15. type of fossil that is an imprint - like a thumb print in play-doh
- 16. changes occurs suddenly
Down
- 1. thick sticky pools at earth's surface
- 2. fossils give us a history of _____ changes
- 3. process by which minerals replace organisms tissues
- 4. footprints and burrows are this type of fossil
- 5. ____ temps slow down decay
- 7. older layers are on bottom if undisturbed
- 9. geologic column is an ___ sequence of rock
- 12. type of dating that is not a specific number but an idea of age
- 16. type of film that leaves a thin layer on a rock