chapter 8 crossword puzzle

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Across
  1. 3. how stars and planets were formed
  2. 5. the explosion of a star
  3. 6. occurred 15 billion years ago
  4. 7. the sun
  5. 8. clumping smaller particles into larger masses forming planets
  6. 11. giant the su will turn into this eventually
  7. 12. the release of volatile substances and water vapor
  8. 13. shrinks under its own weak gravity
  9. 14. of rainfall
  10. 15. every chemical element that made the planets star oceans and organisms
Down
  1. 1. spinning skater
  2. 2. suggests that energy from thermal vents in the sea
  3. 4. iron sunk to the middle of the planet
  4. 9. building blocks of proteins
  5. 10. stars twinkle because of elements being converted over to other elements which gives off