SAND AND CLAY

"In conjunction with... 'Limestone and Marble,' (listed above) and... 'Formation of Soil'... (class 551), this film gives the child an understanding of the rock-soil cycle in nature and its commercial significance. It shows weathering qualities of granite, quartz and the relationship between granite, quartz and sand." Artificial sandstone blocks are made, natural sandstone is quarried, cut into blocks, and fashioned into grinding wheels. Other processes such as the making of brick, tile, and pottery are shown.