Bridges

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Across
  1. 4. the upward forces on a bridge
  2. 7. this shape is modified and strengthened to improve bridge designs
  3. 9. the downward forces are spread outward to the end supports by the curve of this bridge
  4. 10. bridges that are made of a combination of the three basic types of bridges
  5. 11. the main metal used in most modern bridges
  6. 13. this type of bridge includes 2 piers and a deck. The downward forces are spread evenly across the length of the bridge
Down
  1. 1. a simple suspension bridge ______ down between two end supports
  2. 2. typically a low bridge that is built up by stepping stones
  3. 3. the downward forces are concentrated inward where there is no support in these bridges
  4. 5. these ancient peoples developed the first arch bridge using natural cement
  5. 6. a beam bridge that is supported by 2 levers that are weighted by piers
  6. 7. how many basic bridge types are there?
  7. 8. Modern arch bridges are designed with the arch reaching ______ the deck of the bridge
  8. 12. triangles are the main element to help support and strengthen this bridge