Echidnas crosswords

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Across
  1. 3. a 3D shape
  2. 8. a month
  3. 9. explaining
  4. 10. a drink
  5. 11. an injury
  6. 13. unable to do anything
  7. 14. space
  8. 16. chemistry
  9. 18. achievement
  10. 19. have as belonging to one
  11. 20. very likely
Down
  1. 1. without thought
  2. 2. a company
  3. 4. east
  4. 5. a medical vehicle
  5. 6. 1000 years
  6. 7. subjects
  7. 12. quite
  8. 15. someone on board
  9. 17. natural