Across
- 4. mammals which walk upright and evolved in the cenozoic
- 5. shortest era
- 7. era when pangaea formed
- 9. gas produced by cyanobacteria
- 12. evolved during the mesozoic
- 16. mountains formed above India
- 18. invertebrates existed as early as the paleozoic
- 19. have eggs with hard shells, came after amphibians
- 22. largest mass extinction in history
- 23. layer that protects life on land
- 24. period of time when earth was largely lifeless
- 26. descendant of dinosaur - survived mesozoic extinction
- 28. mountains formed when Pangaea formed
- 30. super continent
Down
- 1. animal that dominated the mesozoic era
- 2. lay eggs in water, evolved after fish
- 3. photosynthetic bacteria
- 6. massive mammals which developed in the cenozoic
- 8. climate during the cenozoic when NY was covered in ice
- 10. vertebrates which evolved during the paleozoic
- 11. climate during the mesozoic
- 13. size of mammals in the mesozoic era
- 14. era when Pangaea broke up
- 15. name of northern continent - post pangaea
- 17. plants with seeds but no flowers - evolved in the paleozoic
- 19. mountain found in western US, began forming in the Mesozoic
- 20. earliest era
- 21. name of southern continent - post pangaea
- 25. cause of mesozoic extinction
- 27. when ocean water runs over continents
- 29. mountains just above Italy, formed in the cenozoic