science crossword .

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Across
  1. 3. is a
  2. 6. 14 miles away
  3. 9. concept where humans use science to change the atmosphere and
  4. 12. and the Phoenix lander tested water ice below the surface in 2008.
  5. 13. exists at the poles of
  6. 15. happens once every 26 months.
  7. 17. in orbits around mars
Down
  1. 1. Marineris extends the length of Europe and
  2. 2. have suggested Mars could be terraformed one day.
  3. 4. makes light and is white
  4. 5. two activites on the surface
  5. 7. 7.5 miles away
  6. 8. the fourth planet from the sun.
  7. 10. depths of up to four and a half miles (seven km).
  8. 11. of a planet in order to make it
  9. 14. like Earth.
  10. 16. from asteroids are evident on the