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Occurrence of Metals in the Earth Crust Metals are found in the earth's crust. The least reactive metals are found native as elements e.g. silver, gold, but most are found in compounds, usually oxides or sulphides. The occurrence in nature of metals will affect the cost of extracting and engineering them. Most metals are found as ores usually either as an oxide or a sulphide. Sulphides are even rarer than oxides as these were formed when the earth's crust was solidifying and there was plenty of sulphur from volcanic activity. Oxides became present later in the earth's history when oxygen became more abundant. Redox reductions are used to obtain most of the metals that we all take for granted. Most metals are found occurring naturally in rocks called ores. They are in compounds, chemically bonded to other elements. However, there are metals with very low reactivity that can be found as the elements themselves....

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