chapter 7 & 8 crossword

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Across
  1. 2. warmest ocean and is the trade route between Africa and Asia
  2. 5. when a star converts more hydrogen into heavier elements the energy output rises and the body of the star swells into a _________
  3. 6. year that the UN established major boundaries
  4. 7. why stars twinkle
  5. 10. name of line drawn close to the 180 meridian
  6. 12. what are the boundaries established by the UN for ?
  7. 13. one nautical mile per hour
  8. 15. _________ -iron sunk to the middle of the planet
  9. 18. single continuous land mass that includes Europe and Asia
  10. 19. continent of the south pole
  11. 20. the earth was formed ______ years ago
  12. 22. imaginary line at which a body rotates
  13. 24. unit used in measuring distance at sea
  14. 26. half of the celestial sphere
  15. 27. ___% percent of oceans covered in ice (spell it out)
  16. 29. America includes Canada , Mexico and central America
Down
  1. 1. The galaxy earth belongs to
  2. 3. what were the first organisms on earth
  3. 4. release of volatile substances and water vapor
  4. 8. Modern practice of position fixing that enables a navigator to travel through space
  5. 9. second largest , connects polar waters and is the major shipping ocean
  6. 11. type of boundaries were established by the UN
  7. 14. smallest continent in size
  8. 16. 70% earths surface
  9. 17. percent of ice that covers the earth
  10. 21. stars core will eventually collapse in an explosion
  11. 23. cloud of cold dust and gas within a galaxy
  12. 25. smallest, coldest, ocean also known as the northern sea
  13. 28. the largest ocean that covers 33% of the earth