About This Book
The book guides young readers through how the earth yields useful materials and how people extract and transform them. It explains formation and mining of coal and stone and the workings of shafts and quarries. It describes how sand, clay, and other raw substances become concrete, bricks, and building materials, and how metals are smelted and refined. Separate chapters trace methods for obtaining gold, silver, iron, copper, and aluminum, and outline oil production and salt harvesting. Practical illustrations of furnaces, mills, and machinery accompany discussions of industrial interdependence and opportunities for invention.
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