earth and mars

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Across
  1. 5. Ice found at the poles and beneath some of the surface of Mars
  2. 7. the fifth largest planet in the solar system
  3. 13. core The _____ is a solid sphere made of iron and nickel metals.
  4. 14. An extensive canyon system on the Mars equator
  5. 15. A very large shield volcano mountain on the planet Mars
  6. 16. earth makes a complete orbit around the sun in about 365
Down
  1. 1. earth is _______
  2. 2. the name Earth is a Germanic word, which simply means “____.”
  3. 3. earth has how many moons.
  4. 4. these people have suggested Mars could be terraformed one day.
  5. 6. all of the planets, except for ____, were named after Greek and Roman gods and goddesses
  6. 8. The name Earth is at least ____ years old
  7. 9. The larger of Mars’ two moons, orbits closest to the planet.
  8. 10. earth has no rings
  9. 11. this is the fourth planet from the sun.
  10. 12. The smaller of Mars’ two moons, orbits furthest from the planet.