Greek Roots spelling words

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Across
  1. 2. an instrument for measuring and indicating temperature
  2. 7. expressing regret for something wrong that you did
  3. 8. the highest class in certain societies, especially those with heredity titles
  4. 10. the scientific study of animals
  5. 11. the study of the physical features of the earth
  6. 13. the study of myths and legends
  7. 16. the science that deals with the earth's physical structure
  8. 17. a container that keeps a drink or other hot fluid warm
  9. 18. the study of life
Down
  1. 1. a branch of mathematics relating to points, angles, etc.
  2. 3. a system of government "ruled" by elected officials
  3. 4. (of a device) working on its own
  4. 5. the order of events or dates
  5. 6. a published collection of pieces of writing
  6. 9. the study of human history and prehistorical times
  7. 12. the study of the origins of words
  8. 14. machinery developed from the application of scientific knowledge
  9. 15. relating to heat