Science crossword puzzle

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Across
  1. 1. is the what happened
  2. 5. comes before mars
  3. 7. is soft part of the mantle
  4. 10. is the movement of rocks
  5. 13. are typically cooler and smaller
  6. 14. mantle is a sold material extending all the way to earth core
  7. 16. is 25%
  8. 17. is the layer of molten that surrounds inner core
  9. 18. is the breaking down of rocks.
  10. 20. is the process in which a star gives off energy.
Down
  1. 2. move perpendicular to their direction of travel.
  2. 3. is dense ball of solid metal.
  3. 4. is the uppermost part of mantle and the crust for a ridge layer about 100 kilometers thick
  4. 6. comes before Venus
  5. 8. is expanding ever day
  6. 9. luminosity is grater
  7. 11. move quickly and are the first to be detected.
  8. 12. is the why it happened
  9. 15. comes after a low mass star
  10. 19. is 75%