Theis now desert. Somewhere in its past, it lost the water that flowed over its surface. She also lost a lot of her . In question, according to the dissipation of the Magnetic Field, magnet and field…” data-image=”https://cdn.futura-sciences.com/buildsv6/images/midioriginal/6/a/a/6aa47f5f22_85914_champ-magnetic.jpg” data -url=”https://news.google.com/science/definitions/physics-magnetic-field-3878/” data-more=”Read more”> which until then protected it from This wind is not very dense (10 particles per cubic centimetre), but very fast (400 to 800 km/s). It’s a supersonic wind (it moves faster than waves…” data-url=”https://news.google.com/sciences/definitions/univers-vent-solaire-2445/” data-more =”Read more”> .
Our Earth remains sheltered from its own. It is the result of the movements of liquid iron bubbling some 2,900 kilometers below our feet. In what scientists call the outer core. Movements of on a very large scale that produce a . It is this electric current which generates a magnetic field by dynamo effect.
But about 565 million years ago, the intensity of this magnetic field dropped by about 10%. Before suddenly returning to normal. Just before what researchers call the. One of the most significant events in the history of life on Earth. The sudden appearance of multicellular life forms.
Note that, whenevoke a process which occurred “all of a sudden”, it must be understood that it took a few tens of millions of years… only. Of the (USA) now show that the process in question coincided with the formation of the Earth’s solid inner core.
A story to read in the rocks
“Just before thebegins to expand, the Earth’s magnetic field was about to collapse. But as soon as the inner core grew, the magnetic field regenerated.”underlines John Tarduno, geophysicist, in a .
To determine how the magnetic field and the core of our Earth have evolved over time, the researchers relied on an analysis ofbrought to the surface and containing tiny magnetic particles that record the direction and strength of the magnetic field as the minerals cool. They were thus able to fix two new important dates in the history of the inner core of our planet.
550 million years ago, the Earth’s magnetic field renewed itself after a near collapse only 15 million years earlier. A renewal related to the formation of a solid inner core which has somehow recharged the outer core in The melting point of water, in other words the temperature at which the ice…” data- image=”https://cdn.futura-sciences.com/buildsv6/images/midioriginal/7/d/0/7d0df59f3c_82086_fusion.jpg” data-url=”https://news.google.com/sciences/definitions/ physics-fusion-15305/” data-more=”Read more”>; and 450 million years ago a boundary was formed between the innermost inner core and the outermost inner core. An evolution which coincides with changes in the structure of the The mantle, however solid, is animated by convection currents which…” data-image=”https://cdn.futura-sciences.com/buildsv6/images/midioriginal /7/4/6/7466fb8049_50004180_terre-270907.jpg” data-url=”https://news.google.com/planete/definitions/structure-terre-terrestrial-mantle-2495/” data-more=”Read the more”> underlying, due to the Drift of…” data-image=”https://cdn.futura-sciences.com/buildsv6/images/midioriginal/9/f/c/9fcec5bdc0_45137_plates-tectonics-wikimediacommons- dp.jpg” data-url=”https://news.google.com/planete/definitions/geologie-tectonique-plates-970/” data-more=”Read more”> .
Better understand the
The result of this…” data-image=”https://cdn.futura-sciences.com/buildsv6/images/midioriginal/f/6/7/f678fd3677_50035322_eboulement-cmic-blog-cc-nc-2.jpg ” data-url=”https://news.google.com/planete/definitions/sustainable-development-landfall-6515/” data-more=”Read more”> of its magnetic field had continued. But it is almost certain that our planet would be much drier today. What to show the importance of an inner core to maintain a magnetic field throughout the »concludes John Tarduno.
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