Changing the polarity of the magnetic field.

Main magnetic field created by the flow of molten iron of the violence. Outer core of the Earth. Sometimes reverse the direction of it. For this reason a compass needle would point south rather than the north. The upside of this terminal. Has happened hundreds of times during a course in the history of the world. The last time was about 780,000 years ago, but scientists are still trying to learn that. How did it happen And why it happened. For this reason it is believed that one of the theories. The Earth's rotation causes the turbulence. The destruction of evidence by scientists. And researchers from Princeton and the University Paul Sabatier, France. Pointed out that Our world has turned south on its own for over 800 million years, is also focusing on rocks that contain evidence of the main magnetic field. Has weakened over the the south. This is a sign that the polarity may flip direction. Be the first to get the full 10 points.