Geology on Mars

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Across
  1. 2. a set of interacting parts forming a complex whole
  2. 4. a feature that forms on the surface of the planet (mountain, channel, sand dune)
  3. 7. all the places where life exists
  4. 8. a long narrow groove that forms where water, lava, or other liquid flows
  5. 9. geologist a scientist who studies the geospheres of planets in our solar system
Down
  1. 1. process an event or series of events that causes changes in the geosphere, such as flowing water, landforms, and soil
  2. 3. gases that surround the earth or another planet
  3. 5. all the water on a planet
  4. 6. having the conditions necessary to live