Crossword Title

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Across
  1. 2. curved structure
  2. 6. supporting structure.
  3. 7. supporting a roof, bridge, or other structure.
  4. 8. extend from side to side of.
  5. 9. engineer engineering is a professional engineering deals with the design, construction, and maintenance
  6. 10. wedge-shaped stone piece
  7. 11. being stretched tight.
Down
  1. 1. a structure built on top of something else.
  2. 3. "pushing
  3. 4. structure main elements that support the load
  4. 5. at the ends of a bridge