Habitable Planets

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Across
  1. 2. habitable planet in our solar system
  2. 3. this is needed to breathe
  3. 6. water needs to be in this form to have life
  4. 7. just enough of this is needed but not too much
  5. 9. planets need to have a circular or near circular one
  6. 10. regulates Earth's atmosphere by moving plates
Down
  1. 1. field needed to protect from solar wind & cosmic rays
  2. 4. another name for the habitable zone
  3. 5. a star that the planet revolves around
  4. 8. need to have a stable rotation on its _____