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http://elpais.com/elpais/inenglish.html 17-11-2010 15:48:08
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🗞️After many years, scientists found what they were looking for in a belt of green rocks in Greenland: an iron ore, magnetite, that preserves the signal of an event that occurred about 3.7 bn years ago, allowing them to detect the magnetic field back then english.elpais.com/science-tech/2…