Building Materials
Three basic raw materials which are needed in large quantities for production of steel are

Iron ore, coal and lime stone
Iron ore, carbon and lime stone
Iron ore, coal and sulphur
Iron ore, carbon and sulphur

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Building Materials
Asbestos

Is composed of hydrous silicates of calcium and magnesium (CaSiO3, 3MgSiO3)
Is a natural fibrous mineral substance
Contains iron oxide and alumina
All of these

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