The scientific study of Earth's magnetic field, its sources, variations, and effects.
From geomagnetic (adjective) + -s (noun suffix). This field of study crystallized as a formal discipline in the 20th century, particularly with advances in measuring and understanding magnetism.
Geomagnetics revealed that Earth's magnetic field is getting weaker and preparing to flip—a reversal that last happened 780,000 years ago and takes about 1,000 years to complete!
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