Environmental vocab words

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Across
  1. 3. areas of gas on the sun
  2. 4. how scientist think the continents first started off as
  3. 5. the breaking down of rocks
  4. 9. when the solar system started
  5. 12. sun centered
  6. 13. theory on how the universe started
  7. 16. sun layer that gives off visible light
  8. 18. brightness of a star
  9. 19. when the Big Bang occurred
  10. 20. 25%
Down
  1. 1. energy heats gas on sun causing it to explode into space
  2. 2. the only liquid in the earths layer
  3. 6. fusion process of hydrogen atoms forming to create helium
  4. 7. the carry out of rocks
  5. 8. 75%
  6. 10. first cycle of a stars life
  7. 11. aged how old the sun is
  8. 14. earth centered
  9. 15. glow that comes from the middle layer of the suns atmosphere
  10. 17. the action of dropping of rocks