Amazing Structures

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Across
  1. 3. put (something) down gently or carefully
  2. 4. not deep
  3. 6. a violent disturbance of the peace by a crowd
  4. 7. sand stone
  5. 9. descend from a higher to a lower position; drop downwards
  6. 10. king
  7. 12. fix up, place in a position ready for use
  8. 13. pause, stop
  9. 16. firmly fixed
  10. 18. the action of building something
  11. 19. the lowest part of a building,typically below ground level
Down
  1. 1. state, say something in a solemn and emphatic manner
  2. 2. enormous, huge
  3. 5. floor
  4. 8. make or become straight
  5. 9. weighing machine
  6. 11. column, pillar
  7. 14. inside layer
  8. 15. bend, be in or move into a sloping position
  9. 17. wonder, admiration, a feeling of respect mixed with fear