British-American research team confirms ancient magnetic fields in Greenland rocks dating back 3.7 billion years (Seoul = Yonhap News) Reporter Juyoung Lee = When was the magnetic field that protects the Earth from harmful cosmic radiation and solar wind emitted by the sun born? British and American researchers have discovered evidence showing that magnetic fields … Continue reading Ancient Magnetic Fields Found in Greenland Rocks Dating Back 3.7 Billion Years: Study