Greek and Latin Roots

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Across
  1. 4. Many sides
  2. 7. Mental illness that usually involves manic and depressive episodes
  3. 10. Device used to communicate vocally over distance
  4. 11. Goes against itself
  5. 14. Study of life
  6. 15. Knowledge of any kind
Down
  1. 1. Motorized 2-wheeled vehicle
  2. 2. Thinking back to past events
  3. 3. launched forward
  4. 5. concept of beauty
  5. 6. Stand that uses 3 legs
  6. 8. Free of contamination
  7. 9. To end/destroy something
  8. 12. is there but cannot be seen
  9. 13. Universe containing