CERAMIC

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Across
  1. 2. "Cooking" the clay
  2. 5. Flat pieces of clay are joined
  3. 6. Big owen for ceramic
  4. 7. It can serve to color, decorate or waterproof an item
Down
  1. 1. Unglazed clay
  2. 3. It is helpful in multiplication
  3. 4. Unfired clay