Geologic Time

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Across
  1. 2. ocean water floods continents
  2. 7. era youngest in Phanerozoic eon
  3. 8. physical separation from rest of species
  4. 10. 1st epoch of Quaternary period
  5. 12. water changing to gaseous state
  6. 14. era middle in Phanerozoic eon
  7. 15. marine reptile,small head,long neck,flippers
  8. 16. most recent epoch began 10,000 years ago
  9. 17. ancient landmass supercontinent
  10. 18. Earth's surface covered by glaciers
  11. 20. subdivided eras
  12. 21. oxygen poor soil, plants compress & change
Down
  1. 1. connects two continents
  2. 3. grooves made by rocks in glaciers
  3. 4. longest unit of geologic time
  4. 5. many species dying quickly
  5. 6. using educated guess
  6. 9. subdivided periods
  7. 10. oldest 90% Earth's history
  8. 11. subdivided eons
  9. 13. flying reptile, large bat-like wings
  10. 15. era oldest in Phanerozoic eon
  11. 19. land vertebrate with legs directly below hips