Geology on Mars

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Across
  1. 5. any planet with a solid surface
  2. 9. all the living things on a planet
  3. 10. a rock often found near channels of flowing
  4. 12. an event or series of events that causes
  5. 13. a feature that forms on the surface of a planet
  6. 14. liquid water on a planet
  7. 18. solid part of a rocky planet
Down
  1. 1. or easier to see
  2. 2. a long, narrow groove that forms where liquid flows
  3. 3. for a habitable planet you need liquid water
  4. 4. in the geosphere
  5. 6. a rock often found near channels of flowing
  6. 7. having the conditions necessary to support life
  7. 8. mixture of gases surrounding the planet
  8. 11. an _____ ______
  9. 15. a set of interacting parts forming a complex
  10. 16. us understand something by making it
  11. 17. an object, diagram or computer model that