unit 7 and 8

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Across
  1. 1. cloud of dust and gas
  2. 3. smallest ocean
  3. 4. south of panama
  4. 6. ice on earth
  5. 8. north to south
  6. 9. 1/3 of earth
  7. 12. south pole
  8. 13. united nations established boundaries
  9. 14. east to west
  10. 15. smallest continent
  11. 16. how stars and planets formed
  12. 21. forming of early organisms
  13. 23. ice on land
  14. 24. all connected
  15. 27. star blows up
  16. 28. release of water vapor
  17. 29. oldest rocks found in australia
Down
  1. 1. u.s., mexico & canada
  2. 2. term of tradition
  3. 5. red shift
  4. 7. why stars twinkle
  5. 10. ice on ocean
  6. 11. 15 billion years ago
  7. 17. 3.4-3.5 billion years old
  8. 18. 2nd largest ocean
  9. 19. warmest ocean
  10. 20. features of earth
  11. 22. in 6 billion years
  12. 25. enclosed lakes
  13. 26. made of stars,dust and gas