Across
- 4. Bay in WA with Stromatolites
- 5. Banded Iron Formations
- 10. Microbial communities which are laminated
- 12. A precipitate formed in the young ocean
- 13. The remains of life preserved in rock
- 15. Thought to be the most primitive form of life
- 16. Biggest unit of geological time
- 17. Atom needed for life
- 18. Old rocks found in Greenland that contain evidence of life
- 19. Subatomic particle with no charge
- 21. Fourth planet from our sun
Down
- 1. Gas common in the Earth's early atmosphere
- 2. To become incorporated into a liquid so as to form a solution.
- 3. Chemical reaction converting sunlight to chemical energy
- 6. Variants of a particular chemical element which differ in neutron number
- 7. To be placed in layers
- 8. Builder of stromatolites
- 9. Location of earliest known fossils ______ Bar
- 11. Microbial communities which are not laminated
- 14. A deposit in solid form from a solution.
- 20. Gas produced by photosythesis