Across
- 2. Organism that shapes its environment
- 3. sequence of oldest to youngest layers of rock
- 5. approximate age of specific rock layer
- 9. process of flowing
- 10. Large natural or artificial lake used as source
- 11. Organisms use sunlight to synthesize foods
- 13. Branch of science that deals with fossils
- 15. type of geological contact
- 16. remains or impressions of preserved organism
Down
- 1. Method of dating geological or archeological specimens
- 4. Fossil that is used for dating
- 6. nonliving condition or thing
- 7. synthesis of organic compounds by bacteria
- 8. extent of time at any length
- 12. time required for one-half of the atomic nuclei
- 14. Theory that changes the earths crust