Tower

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Across
  1. 3. To hold up or serve as a foundation
  2. 5. In the past, towers were usually used to house bells, _____ towers or light houses
  3. 9. Sides are the same as a mirror image
  4. 10. Can support weight, but can twist and collapse if not supported
  5. 11. Weight structure holds divided by structure's weight
  6. 12. Can support weight, but twist and collapse if not supported
  7. 13. Strength most stress a substance can bear without tearing apart
  8. 15. All joints should have ______ surfaces before gluing
  9. 16. For tower to be stronger distances between _________
Down
  1. 1. Filling gaps in joints of your towers ______ the structure
  2. 2. A famous old tower which is in Italy
  3. 4. Rigidity of the triangular shape can support weight securely
  4. 6. The action of being stretched to stiffness
  5. 7. is the part that towers are won and lost by
  6. 8. Percent of towers weight that should be glue
  7. 14. A famous old tower which is in France