Earth and Mars

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