Chapter 8 Crossword

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Across
  1. 2. The first organisms on the planet Earth were similar to ________.
  2. 3. Every chemical element that made the planets, stars, oceans, and organisms is made up of_________.
  3. 4. Massive spheres of incandescent gas
  4. 7. Early steps of organisms forming from organic building blocks
  5. 8. At 4.5 billion years, the first _______ was formed.
  6. 12. How stars and planets were formed
  7. 13. _____ is just right.
  8. 14. What happened for 10 million years that formed oceans?
Down
  1. 1. Iron shrunk to the middle of the planet and lighter minerals went to the surface and formed the earth's crust
  2. 5. Protects us from UV light
  3. 6. Occurred 15 billion years ago
  4. 9. The release of volatile substances and water vapor from the earth is called __________.
  5. 10. The name of our galaxy
  6. 11. When a star blows up