You searched for: “geomagnetism
1. The various magnetic things that happen when they are generated by the earth and its atmosphere; and by extension, the magnetic phenomena in interplanetary space.
2. A branch of geology concerned with the magnetic properties of the earth.
This entry is located in the following units: geo-, ge- + (page 14) -ism, -ismus (page 23) magnet-, magneto- + (page 2)