Shapes and Materials

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Across
  1. 3. A window is made of it.
  2. 6. Guns are made of it.
  3. 7. Trees are made of it.
  4. 9. A coffee mug is made of it.
  5. 10. A trouser belt is made of it.
  6. 11. Frozen water.
  7. 12. A wedding ring has it.
Down
  1. 1. Your sweater is made of it.
  2. 2. A water cup is made of it.
  3. 3. A wedding ring is made of it.
  4. 4. Stairs are made of it.
  5. 5. A building is made of it.
  6. 8. A pillow case is made of it.
  7. 9. A T-shirt is made of it.