Engineering towers

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Across
  1. 3. a stress that occurs when members are pulled apart
  2. 5. A good engineer
  3. 7. A structure built onto a preexisting structure
  4. 8. A supporting structure
  5. 10. the stone that keeps a arch from collapsing
  6. 11. a squeezing force
Down
  1. 1. a structure built to support lateral pressure of an arch
  2. 2. it suspeneds in the air
  3. 4. a semi circle that can hold up bridges
  4. 6. A framework made of triangles
  5. 9. extend side to side