Iron is everywhere!! Not really, but it is very abundant. It is the sixth most abundant element in the universe and the fourth most abundant on the earth's core. Iron constitutes 95% of all metal tonnage on the earth. So it really is all over the place. I'm originally from Pittsburgh, the steel city, and iron is used to make steel which is an alloy between carbon(coal) and iron. I bet the reason that there is so much iron in our manufactured world is that it is in steel, which is used for building, cars, ships, appliances, etc etc...
Iron ore is apparently costly to process, so the steel industry has actually been recycling for over 150 years. Steel doesn't lose any of its properties when recycled, and recycling requires much less energy output than creating steel from iron ore.
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