Chapter 7 & 8 Crossword

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Across
  1. 7. explosion of a star
  2. 9. Ice covers about ___ of earth
  3. 11. a very large star of high luminosity and low surface temperature
  4. 13. a cloud of gas and dust in outer space that is visible in the night sky
  5. 15. what color penetrates the ocean the best
  6. 16. North American doesn’t include
  7. 17. covers 20.8% of earth
  8. 19. a fixed reference line for the measurement of coordinates
  9. 20. smallest,coldest, and is known as the Northern Sea.
  10. 22. an imaginary line through the pacific ocean
  11. 25. lasted 50-70 million years
  12. 28. continent of the south pole
Down
  1. 1. first organisms on earth that appeared almost 4 billion years ago
  2. 2. what is responsible for the formation of Earth’s gravitational pull
  3. 3. most accurate representation of the features of earth
  4. 4. Planets solidified in a process known as
  5. 5. is a star
  6. 6. covers 30.5% of earth
  7. 8. action of observing or finding one’s way by using the moon, sun, and stars
  8. 10. connects polar waters
  9. 12. the reason why stars twinkle
  10. 14. The tallest mountain in the world
  11. 18. North America includes ____, Mexico, & Canada
  12. 21. a unit of speed equal to 1 nautical mile
  13. 23. a unit of distance , set by international agreement
  14. 24. fell for 10 million years
  15. 26. release of gas or vapor
  16. 27. the name of our galaxy