Earth and Mars

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Across
  1. 1. The planet is constantly ____
  2. 6. the ___ was once believed to be the centre of the universe
  3. 8. earth has ____ moon
  4. 10. Earth is the only planet not named after a ___
  5. 11. Earth is a _____ planet
  6. 13. Earth is about 4.54 ___ years old.
  7. 14. field earth has powerful ____
  8. 16. the planet moves around the ___
Down
  1. 2. earth has an uneven _____ field
  2. 3. system The Earth is the densest planet in the ____
  3. 4. mars has two ___
  4. 5. There is only one natural ____ of the planet Earth
  5. 7. mars is named after a ___
  6. 9. Earth's ___ isn't uniform
  7. 12. Mars is smaller than ______ with a diameter of 4217 miles.
  8. 14. mars is home to the tallest ____ in our solar system
  9. 15. ___ is the fourth planet from the sun