IPA: /ˌdʒiːoʊˈmæɡnɪk/
KK: /dʒiːoʊˈmæɡnɪk/
Related to the Earth's magnetic field or the study of it.
Scientists study geomagnetic phenomena to understand the Earth's magnetic environment.
Geomagnetic → It is formed from "geo-" (from Greek "gē", meaning earth) and "magnetic" (from Greek "magnetis", meaning of or pertaining to a magnet). The word "geomagnetic" refers to the magnetic properties or phenomena related to the Earth.
Think of 'geo-' meaning 'earth' and 'magnetic' relating to magnets — together they describe the magnetic properties of the Earth.