Английский язык, нужно разобрать предложения по составу The naturally occurring materials containing compounds of the metals which may be economically extracted are called ores.
The ores contain, in addition to the oxides and carbonate of the metal, small amounts of combined sulphur, phosphorus, and manganese and are mixed with more or less sand and clay. The metals from lithium down to manganese are obtained by electrolysis of melted compounds that conduct an electric current.
The science which treats of the methods used to obtain the metals in free condition from compounds that occur in nature is called metallurgy.

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