Advanced IELTS CROSSWORD W6

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Across
  1. 1. Sinking of the ground due to underground material removal
  2. 6. A propeller-like device for moving a vehicle, e.g., underwater
  3. 8. Not able to be maintained at the current rate
  4. 10. A synthetic polymer used in plastic bags
  5. 12. Chemical process causing gradual destruction, e.g., of metal
  6. 15. Willing to take risks; courageous
  7. 16. Site where waste is buried under the ground
  8. 18. The outer areas of a town or city
  9. 20. The process of using things up, like resources or energy
Down
  1. 2. In a way that achieves maximum productivity with minimum waste
  2. 3. An opening in a wall, door, or vehicle
  3. 4. A ship or large boat
  4. 5. Obeying rules or commands
  5. 7. Able to find quick and clever ways to overcome difficulties (from personal qualities in space exploration)
  6. 9. Acting in accordance with one's conscience; diligent
  7. 11. The study of human history through excavation
  8. 13. Positive and confident about the future
  9. 14. Basic physical and organizational structures needed for society
  10. 17. Able to make decisions quickly
  11. 19. Grammatical structure where subject and verb switch places for emphasis