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Across
  1. 2. less good or desirable
  2. 3. having or showing the qualities that deserve the specified action or regard
  3. 5. an oxide containing two atoms of oxygen
  4. 6. an employee
  5. 10. a paper listing questions or tasks for students
  6. 11. a single distinct meaningful element of speech or writing
  7. 12. chemical element
  8. 13. extending or reaching throughout the world
  9. 14. equivalent in value to the sum or item specified
  10. 15. the quality of being experienced and sophisticated
  11. 16. the weather conditions prevailing in an area over a long time
  12. 17. great admiration or devotion shown towards a person
  13. 19. the degree of skill with which a product is made or a job done
  14. 20. having no real value or use
  15. 21. of the poorest quality or lowest standard
Down
  1. 1. the state of the atmosphere at a particular place and time
  2. 4. the people engaged in or available for work
  3. 7. a glass building in where plants grow
  4. 8. reaching a high or the highest degree
  5. 9. the earth
  6. 11. able to be worked, fashioned or manipulated
  7. 14. state of being unimportant and useless
  8. 15. creeping or burrowing invertebrate animal with a long, slender body
  9. 18. a device containing gunpowder and other combustible chemicals