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Traditional pottery techniques such as coiling and wheel-throwing require the clay to be —clearedclearingclearclearance of air bubbles before shaping begins, since trapped air can cause pieces to crack during firing. Once a vessel is formed, it must —drydrieddryingdryness slowly to prevent warping. Glazes are then applied and the pottery is fired at temperatures high enough to —fusefusionfusedfusing the clay particles into a hard, —durabledurabilitydurablyendure surface.