the earth's magnetic field and associated phenomena.
the branch of geophysics that studies such phenomena.
Origin of geomagnetism
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the magnetic field of the earth
the branch of physics concerned with this
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
The magnetic properties of the Earth and its atmosphere.
The study of these properties.
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