Greek and Latin roots

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Across
  1. 3. a group of seven singers or musicians
  2. 4. eight sided shape
  3. 5. nine sided polygon
  4. 9. one part in a hundred
  5. 11. one tenth of a meter
  6. 12. tenth month of the year
  7. 14. a period of ten years
  8. 15. a person who is between 70 - 79 years old
  9. 16. a group of 8 such as musical notes
  10. 17. two dimensional figure six angles and six sides
Down
  1. 1. relating to the temperature scale in which the boiling water is at 100 degrees and the freezing water is at 0 degrees
  2. 2. lasting for 7 years
  3. 5. the eleventh month of the year
  4. 6. Ninth month of the year
  5. 7. a length equal to 1/100 meter
  6. 8. measures the position of the stars and sun
  7. 10. an officer in the ancient Roman army
  8. 11. based on the number 10
  9. 12. a sea animal with 8 long arms
  10. 13. a period of 100 years