Across
- 2. you breath it in
- 4. tiny living things
- 7. where do you see boiling liquid rock?
- 10. the planet we live on
- 11. you see it at night in the sky
- 12. a very special star
- 13. big problem in the north 60.000 years ago
- 14. we are learning this for ....
- 16. explanation of signs on the map
- 17. animals that don't lay eggs
- 19. plants evolved from....
- 20. a very long period
Down
- 1. there are three ..... in the Phanerozoic eon
- 3. big animal in the mesozoic
- 5. process of change
- 6. remains of ancient plants and animals
- 8. the layer of gases around earth
- 9. the force that keeps us on earth
- 15. last period of Paleozoic
- 18. a hot glowing ball of hydrogen gas