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The magnetosphere of the Earth extends far into space and protects the surface of our planet from most high-energy particles, making it fit for life. There is a geomagnetism in the bowels, where is the solid iron-nickel nucleus of the Earth, heated to 5500 ° C.
Once warmed up, the Earth's core was very fluid and raging, generating a magnetic field. However, its temperature has gradually decreased, its agitation has slowed down and the magnetosphere has weakened – up to the dangerous level of life on the planet. At one point, the inner core of the Earth began to freeze, which added a new "magnetic force" to the planet.
According to Naked Science, scientists had assumed that it was about 0.5 to 2.5. there are billions of years. However, geologists from the University of Rochester have been able to determine much more accurately the date of this event – 565 million years ago
. During the study, researchers analyzed the particle orientation of certain minerals, influenced by changes in the overall magnetic field. The researchers studied the orientation of the pyroxenes and crystalline spars found near the town of Seth-Il in Quebec Canada – they were aged 550 to 600 million years old.
The crystals showed that the magnetosphere was then experiencing difficult times – it was weakening and changing the polarity dozens of times faster than it is at the present stage. However, at some point, the process stopped and began to reverse. The magnetic field has started to increase.
The described cooling of the nucleus coincides with the end of the edicar period, which was crowned by one of the global extinctions of the biosphere. And the restoration and amplification of the magnetic field coincide with the Cambrian explosion of biodiversity at the time, at the time of the appearance of the ancestors of all modern animals. It is possible that the bombardment of the planet by cosmic radiation has contributed to the survival and development of new forms of life.
"When it will be close": Mars was approaching the minimum distance from the Earth – PHOTO
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