Enlarged Heart With Fluid Around It

few years, the Earth's magnetic poles reverse themselves

Index, 2010. September 14

the Earth's magnetic poles reversed an average of 200-300 thousand per year, north and south change places. Why this is happening, I still can not explain the exact science, but it is probably the planet's core located outside of large quantities of molten iron may be associated with the phenomenon.
Past models of a pole shifts from 4000 to 5000 years, but now an American geologists have found evidence that even a couple of years as well as swap space on the north and south magnetic pole.

the first time in 1995, geologists found a rock in the Steens Mountains, Oregon Mountains, which questioned the general model. The former lava magnetic domains [1] direction showed that while the lava cold (and thus preserved in the direction towards the magnetic poles), daily for six degrees migrated farther corners of the Earth's magnetic. This theory, it could have ten thousand times faster. The discovery also has been surrounded by disputes, and many geologists will not accept the results as credible researchers.

Now, however, has a similar formations hunting team has found new evidence [2], Nevada. The Battle Mountain rock found near the hill solidified 15 million years ago. Peculiarity is that after cold and the magnetic domains are firmly rooted in it, one year after another from vulkánkitörésből lávaréteg covered in what újramágnesezte thawed and the upper layer. The two layers, the geologists measured by 53 degrees to the magnetic field direction, ie in one year so much movement in the Earth's magnetic poles. On this basis, 15 million years ago, only four years to complete póluscseréhez.

last 780 thousand years ago such an event took place on Earth, this discovery scientists after the Matuyama-Brunhes event [3], known as the geology. Sharing of research results that lasted much of 1200 and 10 years among the estimated thousands of studies of different research groups. Although this suggests that the next time to have a strong North-South exchange, however, the measurement results show that significantly weakened the Earth's magnetic field, which is likely to delay the polarity.