Geomagnetism - 3 of 13
Geomagnetism FAQs - 13 Found
Although extremely unlikely, it might be possible for a reversal of the Earth's magnetic field to be triggered by a meteorite or comet impact, or even for it to be caused by something more "gentle," such as the melting of the polar ice caps.
But self-contained dynamic systems like Earth’s dynamo can do this without any outside influence. Reversals of Earth's magnetic field can simply happen.