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Iron
Iron forms the Earth's inner and outer core. It is a metal that is available on a number of planets in our galaxy. It can be found in rocks and biological matter but too much in our blood can be toxic.
This is a programme from the Βι¶ΉΤΌΕΔ World Service Archive and was originally broadcast in 1998.
Βι¶ΉΤΌΕΔ World Service Archive
This programme was restored as part of the World Service archive project