Bridges

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Across
  1. 2. First to use arch bridges
  2. 7. One of the main types of bridges
  3. 8. Support in an arch bridge
  4. 11. Bridge that has a main cable
  5. 12. First to use rope bridges
  6. 14. Strongest shape
  7. 15. Sliding on past
Down
  1. 1. Passage over obstacle
  2. 3. Has a keystone
  3. 4. Squeeze
  4. 5. Mrs. Wink's favorite
  5. 6. Weight of structure itself
  6. 9. Bridge that uses triangles
  7. 10. Pull apart
  8. 13. Changing weight on the structure