earth and mars

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Across
  1. 3. our neighboring planet
  2. 4. moon
  3. 6. earths forth layer
  4. 11. protects us from meteoroids
  5. 13. earths first layer
  6. 15. our home
Down
  1. 1. mars is known as this
  2. 2. volcano
  3. 5. earths second layer
  4. 7. earths third layer
  5. 8. 70% of the earth
  6. 9. earth has just one of these
  7. 10. every four years is a?
  8. 12. moon
  9. 14. planet type