chapter 7 and 8 crossword

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Across
  1. 1. The type of water scientists look for in comets and in the oceans to see if there proportions match
  2. 7. Political boundary that separates North and South America
  3. 10. United States, Mexico, and Canada
  4. 12. Believed to have once had a magnetic field that disappeared when its core cooled
  5. 14. The most common map used in classrooms
  6. 17. How quickly is the earth every year?
  7. 19. Surrounded by the Mediterranean Sea, Indian Ocean, and the Atlantic Ocean
  8. 21. Lines of Longitude
  9. 22. The center of this ocean is ice that is 10 feet deep
  10. 23. Smallest continent
  11. 24. Was the moon closer of farther when the Earth was younger
  12. 28. Name of the Earth when the outer surface was completely molten
  13. 29. Place where the primary reference line passes through
Down
  1. 2. Largest ocean in the world
  2. 3. Distorts the continents as little as possible
  3. 4. Earths iron core protects the earth from
  4. 5. second largest ocean
  5. 6. Its axis is tilted at 23 1/2 degrees
  6. 8. imaginary line running mostly along 180 degrees meridian
  7. 9. When the earth first formed, what was the earth like
  8. 11. Younger than the earth by millions of years
  9. 13. Lines of latitude
  10. 15. 1.85km is equal to
  11. 16. The continent of the South Pole
  12. 18. Distance measured by marine and air navigators
  13. 20. Earth is born
  14. 25. America Everything south of Panama
  15. 26. Color that can penetrate the ocean water the deepest
  16. 27. When the Earth was liquid rock, what element sank towards earths center
  17. 30. General shape of the earth