geomagnetism
noun/ˌdʒiːəʊˈmæɡnətɪzəm/
/ˌdʒiːəʊˈmæɡnətɪzəm/
[uncountable] (geology)- the study of the magnetic characteristics of the earth
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geomagnetism
Definition of geomagnetism noun from the Oxford Advanced Learner's Dictionary