===----Science----===

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Across
  1. 2. Characteristics of a material such as hardness, strength, cost, etc.
  2. 5. A sticky substance used to join materials together.
  3. 6. Formed with metal or plastic by melting or soldering two parts together.
  4. 8. How pleasing a structure is to the eye
  5. 9. A joint made to allow movment
  6. 13. A structure found in nature such as a mushroom.
  7. 14. The job a structure does.
  8. 15. A thinly shaped out layer of a material
  9. 16. A beaver dam is an example of this type of structure.
  10. 17. These kind of structures are made by people.
Down
  1. 1. A joint that allows no movement.
  2. 3. Where two parts are connected together
  3. 4. hardware (nails, screws, staples.)
  4. 7. Flexible material is woven together to keep different parts of a structure together
  5. 10. When parts of structure are shaped in a certain way to fit.
  6. 11. When a structure is made to do better than it can do.
  7. 12. Has a skeleton made of very strong .materials