1. Earth has been assumed or imagined by the scientists as a huge magnetic dipole.
2. The south pole of the imaginary magnet inside the Earth is located near the geographic north pole and the north pole of the Earth’s magnet is located near the geographic south pole.
3. The line joining these magnetic poles is called the magnetic axis.
4. The magnetic axis intersects the geographic north pole at a point called the north geomagnetic pole or northern magnetic pole.
5. It intersects the geographic south pole at a point called the south geomagnetic pole or southern magnetic pole.
6. The magnetic axis and the geographical axis (axis of rotation) do not coincide with each other.
7. The cause of the Earth’s magnetism, are as follows.
- Masses of magnetic substances in the Earth
- Radiations from the Sun
- Action of the Moon
