geomagnetism; terrestrial magnetism
Scientific term for the Earth's magnetic field and related phenomena.
Geomagnetism originates from within the Earth.
Reversals of the Earth's magnetic field have occurred many times in the past.
磁気 is a broader term for magnetism in general, not limited to the Earth.
geomagnetic reversal; reversal of Earth's magnetic field
Compound of 地 (earth) and 磁気 (magnetism).