Towers Vocab

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Across
  1. 4. What's it called when a tower is being stretched tightly?
  2. 7. What's a supporting structure called?
  3. 9. What's a central stone in a arch called?
  4. 10. What's a structure that absorbs shock called?
  5. 11. What type of bridge involves many triangles?
Down
  1. 1. Who maintains and designs structures?
  2. 2. What's part of a bridge between piers?
  3. 3. What is it called when you're putting pressure on the both sides of the structure by pushing?
  4. 5. What's curved symmetrical shape thats on bridges?
  5. 6. What's a structure built on top of something else called?
  6. 8. This is put the end of bridges and supports pressure using arch or spans