Bridge Crossword

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Across
  1. 3. forces that try to make materials tear and slide by each other
  2. 4. supports under a bridge
  3. 8. Suspension bridge built across Tacoma Narrows
  4. 9. forces that try to stretch material and pull it apart
  5. 11. Forces that try and twist and bend material
Down
  1. 1. portion of the bridge that supports the deck and connects one substructure element to another
  2. 2. type of truss that consist of triangles
  3. 5. type of truss similar to pratt and warren but completely upside down
  4. 6. forces that try to push or squeeze material together
  5. 7. type of truss similar to pratt but upside down
  6. 10. type of truss with a polygonal design