Across
- 3. cycle co2 cycle
- 7. 3rd Atmosphere
- 10. conclusive
- 13. 2nd Atmosphere
- 16. age icy time
- 17. looking for gold
- 19. Layer o3 Layer
- 20. 4th Atmosphere
- 21. Dioxide co2
Down
- 1. thunder and rain
- 2. summarise with arrows
- 4. biotic range
- 5. change CC
- 6. co2 --> oxygen
- 8. A sphere
- 9. tree
- 11. co2 sea weed process
- 12. 1st Atmosphere
- 14. hot and burn
- 15. level height of ocean
- 18. black mining
- 19. surface top of ocean