Polo Dance
2006/11/01 Elhuyar Zientzia Iturria: Elhuyar aldizkaria
The pole of Earth is not standing. In the case of the magnetic pole, the idea goes from the term to yellow, but the geographic pole has also changed from place to time. Both cases have a different origin, the magnetic pole changes for the core of the planet and the geographic pole for the mantle.
An ancient theory states that the mantle of the Earth is not totally homogeneous, that is, that in some places it has more matter than in others. This irregular distribution of matter causes an imbalance in rotation. Consequently, the planet has a small balance and the axis of rotation -- and the geographic pole -- moves slightly over time.
Some French geologists have recovered this theory and from there they have analyzed the current location of the geographic pole. They say it is a consequence of the last balance movement that occurred 800 million years ago. But more interesting than the result is the debate that has prompted the recovery of the theory.
