tower

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