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== Earth minerals and metal ores == {{Main|Mineral|Ore}} [[File:GoldOreUSGOV.jpg|thumb|Raw gold ore that is eventually smelted down into gold metal]] {{Further|Mining}} Earth minerals and [[metal]] ores are examples of non-renewable resources. The metals themselves are present in vast amounts in Earth's [[crust (geology)|crust]], and their extraction by humans only occurs where they are concentrated by [[Ore genesis|natural geological processes]] (such as heat, pressure, organic activity, weathering and other processes) enough to become economically viable to extract. These processes generally take from tens of thousands to millions of years, through [[plate tectonics]], [[tectonic subsidence]] and [[crustal recycling]]. The localized deposits of metal ores near the surface which can be extracted economically by humans are non-renewable in human time-frames. There are certain [[rare earth mineral]]s and [[rare earth element|elements]] that are more scarce and exhaustible than others. These are in high demand in [[manufacturing]], particularly for the [[electronics industry]].
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