资源 标记: Clay Processing
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1984-01-01 People discovered bow to use clay over 20,000 years ago. The basic principles of shaping, drying, and firing clay are still the same today as they were then. The only significant changes since the discovery of clay have been the identification of additional clay materials and improvements in the...
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1984-01-01 Clay occurs naturally almost everywhere in the world and is formed by the action of weathering on several kinds of rocks. This process takes many thousands of years, but it happens wherever the rocks are exposed to the natural forces of wind, water, frost, etc. The rocks change very slowly in...