Chapter 7 & 8 crossword

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Across
  1. 4. what event occurred 15 billion years ago
  2. 8. enclosed some seas are- isolated from other sections of ocean
  3. 9. what is it called when the stars blow up
  4. 11. tides Single moon provides for
  5. 12. some seas are enclosed lakes such as
  6. 14. out of the six major continental lands which is the first area
  7. 15. Hubble who discovered the redshift
  8. 17. What year did stanley miller experiment
  9. 18. what's the deepest color you can go to in the ocean
  10. 19. which ocean is the second and youngest ocean
  11. 20. ice covers what percent of earth's total surface
  12. 23. what percent of the ocean's surface is covered
  13. 26. the Indian ocean has the - trade route between Africa and Asia
  14. 27. some seas are
Down
  1. 1. theory a - theory is how stars and planets were formed
  2. 2. planets are formed through what
  3. 3. a cloud of cold dust and gas within a galaxy is called
  4. 5. stars,dust, and gas are held together by
  5. 6. north america includes u.s, mexico and
  6. 7. inner material concentrated into a - and outer material formed outer planets
  7. 8. which ocean covers one third of earth's surface
  8. 10. how do the stars shine
  9. 13. what is it called when iron sunk to the middle of the planet
  10. 14. which ocean is the smallest and includes water from north
  11. 16. gas massive spheres are called
  12. 17. in - the united nations established the boundaries of the ocean and continents
  13. 21. skater a solar nebula is like a
  14. 22. what percent of the land masses are covered
  15. 24. which planet is a typical
  16. 25. way the galaxy is spiraled by