Clay Crossword Puzzle

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Across
  1. 2. Silica melts at
  2. 7. Silica melts into a _______________ glass
  3. 10. The glossy covering put onto objects made from clay after its been fired
  4. 11. the glassy substance that occurs with other oxides
  5. 13. An important part of clay
  6. 16. Hardens the clay after its fired.
  7. 18. Clay too slippery to use alone
  8. 19. The substance that gives similar results to silica
  9. 21. A process done to get all bubbles out of clay, also known as kneeding the clay
  10. 23. Clay come in how many categories?
Down
  1. 1. Earths crust is __% silica
  2. 3. Silica occurs naturally as ____ and sand
  3. 4. Clay found between coal beds
  4. 5. Two of the tree main components of clay
  5. 6. Silica is an _________ part of clay
  6. 8. Silica is hard and _______
  7. 9. The purest of all primary clays
  8. 12. The main component of this is silica.
  9. 14. One of the three main components of clay
  10. 15. A smooth combination of water and clay.
  11. 17. The substance mixed with silica
  12. 18. Clay formed from volcanic ash
  13. 20. Fluxes and silica bring ______ the melting tempurature
  14. 22. Clay is made of how many components?