Earth in it's place Review

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Across
  1. 4. rapid expansion formation of universe
  2. 7. layer of earth that is liquid
  3. 9. a pattern of lines showing composition of stars
  4. 11. accepted idea of moon's formation
  5. 14. earth earth layer has different function
  6. 16. how we know of the earth's layers
  7. 17. not much gas, too hot
  8. 18. gas and dust sticking together forming planets
  9. 19. cloud of gas and dust
Down
  1. 1. cold allowing for gas to condense
  2. 2. brittle outer mechanical layer
  3. 3. moon is very similar to this layer of earth
  4. 5. spectal lines shifting showing moving away
  5. 6. caused our nebula to swirl
  6. 8. earth's crust made of metals
  7. 10. core made up of this
  8. 12. area where earthquake waves speed up
  9. 13. each earth layer made of different things
  10. 15. earth's crust made of granite