The Old Theory Until now, there was only one theory regarding the source of Earth's magnetic field, which is the internal dynamo theory. This theory was accepte

Researchers first thought a huge magnet ran through the planet. Next, they thought there was a dynamo in the inner core. Then, they thought a dynamo might exist

Discusses the issues of geomagnetism, including why the Earth's magnetic north differs from its geographic north, how animals use geomagnetism for migration pur