The Earths Inner Core
Published on Nov 22, 2015
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HOW OLD IS THE EARTHS INNER CORE.
KAY LANCASTER, DEPARTMENT OF EARTH, OCEAN AND ECOLOGICAL SCIENCE
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The school that leaded this research is the University of Liverpool. There research supports that the earths inner core was formed 1-1.5 billion years ago and it froze its molten iron core.
Photo by NASA's Marshall Space Flight Center
The timing of the first appearance of solid iron or "nucleation" of the inner core is highly controversial but is crucial for determining the properties and history of the Earth's interior and has strong implications for how the Earth's magnetic field -- which acts as a shield against harmful radiation from the sun, as well as a useful navigational aid -- is generated.
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The Earths magnetic field is generated by the liquid alloy that's is in the outer core of the Earth which is approximately 3000km beneath the Earths crust. These motion occurs because the core is loosing heat to the over laying solid mantle which produces the phenomenon of convection
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I want to add that this concludes that or planet contrast to Mars with its strong magnetic field but which died out after half a billion years.
Source:http://www.sciencedaily.com/releases/2015/10/151007135656.htm
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