Greek combining forms

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Across
  1. 4. A system of government by the people
  2. 6. Tube for seeing above water
  3. 8. Distance around a shape
  4. 9. Stories about gods and heroes
Down
  1. 1. Rich and powerful ruling class
  2. 2. Distance across a circle through the center
  3. 3. A design made of initials
  4. 5. Study of stars and zodiac signs
  5. 7. Study of nature and the environment
  6. 10. Words that sound or look the same but have different meanings