GEOLOGY ON MARS REVIEW

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Across
  1. 2. - a structure on the surface of the Earth.
  2. 3. - facts or observations
  3. 4. - has many parts that interact
  4. 6. - life can live there
  5. 8. - a long narrow hole or groove made by flowing water or lava
  6. 9. - explains the evidence
Down
  1. 1. - The same events on Earth cause the same changes as they do on Mars.
  2. 5. - an event that can change the geosphere
  3. 7. - Earth and Mars are both this
  4. 8. - the argument you are making