Chapter 7 and 8 Crossword

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Across
  1. 2. what is the smallest ocean?
  2. 5. how much ice is on earth?
  3. 6. includes all countries south of panama
  4. 8. oldest rocks
  5. 10. discovered that stars and galaxies are receding from earth
  6. 12. where is antartica?
  7. 13. united nations established boundaries of oceans and continents
  8. 15. what will the sun do after red giant?
  9. 18. how stars and planets were formed
  10. 20. how many continents?
  11. 22. how much ice is on land?
  12. 23. incandescent gas
  13. 25. trade route for africa and asia
  14. 26. how were oceans formed?
  15. 28. are all ocean basins connected?
  16. 29. ours is the milkyway
  17. 30. what happens to the sun in 6 billion years?
Down
  1. 1. aggregations of gas and dust
  2. 3. how much of earth is water?
  3. 4. how long did rain fall on earth?
  4. 7. why does the moon have a metallic core?
  5. 9. why do stars twinkle?
  6. 11. how old is earth?
  7. 14. birth of the universe
  8. 16. early steps of organisms forming
  9. 17. what is the largest ocean?
  10. 19. youngest ocean
  11. 21. how were planets formed?
  12. 24. release of volatile substances and water vapor
  13. 27. smallest continent