mars and venus

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Across
  1. 2. diameter 7.5 miles
  2. 4. what we breath in
  3. 5. has a diameter of 14 miles
  4. 7. landed on mars in 1997
  5. 8. an alternative name for the earth
  6. 10. roman name of mars
  7. 11. the asteroid that circles the earth
Down
  1. 1. what counts as a full year.
  2. 3. germanic name for earth
  3. 6. 4th planet from the some
  4. 9. our home planet