Chapter 8 Crossword

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Across
  1. 3. The early atmosphere included ________, ammonia, carbon dioxide, water vapor and other gasses
  2. 9. what formed the first clouds
  3. 12. Density ________ is the sinking of iron into the center of the planet
  4. 16. the sun is predicted to turn into what in 6 billion years
  5. 17. Every chemical element that makes up everything
  6. 18. The type of energy of falling debris
Down
  1. 1. Solar nebula is like a
  2. 2. The explosion of a star
  3. 4. the huble telescope discovered that the universe is still ____
  4. 5. how long ago was the big bang predicted to be
  5. 6. _____ theory shows how the planets and stars were formed in a nebula
  6. 7. the earth is the only planet with ______ ______
  7. 8. what were the first life forms on earth
  8. 10. our solar system is in the ______ galaxy
  9. 11. Water collected in _____ when the ocean formed
  10. 13. Clumping of small particles into larger masses
  11. 14. ____ acids are the building blocks of life
  12. 15. ______ and helium were abundant in the galaxy after the big bang
  13. 19. the moon was _____ when the earth was younger