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Aluminium in compounds (e.g. aluminum oxide) is the most abundant metallic substance on earth, and the third most abundant of all the elements (after oxygen and silicon). Aluminium found in its natural state almost always exist as oxides or silicates because of it's high reactivity order.

However, if you are to extract the aluminum from their ores; namely bauxite, to be process into 'pure' aluminum then the economically viable ores available (by today's processing methods) is predicted to run out by 2074. (Source: http://www.wcoes.org/2008/06/peak-aluminum.HTML)

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Related Questions

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