Chapter 8 Crossword

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Across
  1. 5. Core of an star collapsing in an explosion.
  2. 10. The name of small early planets.
  3. 13. Planets formed through this process.
  4. 15. What shrinks under it's own weak gravity and also where stars form?
  5. 17. Formed by outer material.
  6. 18. Most known theory for the start of the universe.
  7. 19. What rocks determine the age of the crust?
  8. 20. What type of elements sank toward Earth's center?
  9. 21. A planet believed to once have had an magnetic field that disappeared as the planet cooled.
  10. 23. Water collected in these to create the oceans.
  11. 25. Release of volatile substances and water vapor.
  12. 27. Outgassing occurred and caused these to form in the upper atmosphere.
  13. 29. A star swelling up due to energy output rising.
  14. 30. Our galaxy.
Down
  1. 1. Discovery that stars and galaxies are receding.
  2. 2. Inner materials made.
  3. 3. Oldest fossils look like this.
  4. 4. Shape of our galaxy.
  5. 6. Protects us from UV.
  6. 7. Suggested heat energy from thermal vents in the sea.
  7. 8. Iron sinking to the middle.
  8. 9. Early steps of organism forming from organic building blocks.
  9. 11. All chemical elements that made up planets, stars, oceans, and organisms.
  10. 12. Earth was heated by this type of energy.
  11. 14. This was done to clouds which in turn caused heavy rains to fall.
  12. 16. Who made an Experiment in 1953 about origins of life.
  13. 22. This fell for 10 million years and aided in the process of creating the ocean.
  14. 24. The force that keeps us from not floating around.
  15. 26. The magnetic field protects Earth against what?
  16. 28. What the Milky Way is.