Earth, Sun & Moon

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Across
  1. 1. I have seven layers
  2. 3. air is a type of this
  3. 4. awake
  4. 6. moon landscapes
  5. 9. goes round and round
  6. 11. I have craters on me
  7. 12. 1 million of me fit in the sun
  8. 15. my _____ follows me
Down
  1. 2. it's dark
  2. 5. the earth sits on it
  3. 7. mirrors
  4. 8. spin
  5. 10. goes from boulders to pebbles
  6. 13. The sun
  7. 14. Solar System