extraction of metals from its ores present in the earth crust?
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An ore is any naturally-occurring source of a metal that you can economically extract the metal from.
Aluminium, for example, is the most common metal in the Earth's crust, occurring in all sorts of minerals. However, it isn't economically worthwhile to extract it from most of these minerals. Instead, the usual ore of aluminium is bauxite - which contains from 50 - 70% of aluminium oxide.
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