Geology on Mars

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Across
  1. 3. a long, narrow groove that forms where water, lava, or other liquid flows
  2. 5. a feature that forms on the surface of a planet, such as a mountain, channel, or sand dune
  3. 7. any planet with a solid surface, such as Earth or Mars
  4. 8. an event or series of events that causes changes in the geosphere, such as flowing water or flowing lava
  5. 10. the mixture of gasses surrounding a planet
  6. 11. the solid part of a rocky planet
Down
  1. 1. an object, diagram, or computer program that helps us understand something by making it simpler or easier to see
  2. 2. having the conditions necessary to support life
  3. 4. all the liquid water and solid water (ice) on a planet
  4. 6. all the living things on a planet
  5. 9. a set of interacting parts forming a complex whole