Engineering Towers

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Across
  1. 3. A framework of triangles
  2. 6. The part of a structure that is underground
  3. 7. A structure that is held up by cables connected to a tower
  4. 9. The pulling force
  5. 10. The stone placed at the tip of an arch which holds the arch together
  6. 11. A curved structure built to support a structure above it
Down
  1. 1. A person who designs and builds structures
  2. 2. The squeezing force
  3. 4. The part of a structure that is above ground
  4. 5. A structure built to support the ends of a bridge
  5. 8. The part of a bridge in between the supports