Diversity of Materials

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Across
  1. 2. A clear material often used to make windows and spectacles.
  2. 3. A strong, stiff material obtained from the trunks of trees.
  3. 4. A material that breaks easily is said to be _____.
Down
  1. 1. A property of a material that does not allow water to pass through.
  2. 5. A flexible material made from the skin of animals.