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Monday, April 29, 2013

Earth's core far hotter than thought


 26 April 2013 

Earth's core far hotter than thought

By Jason Palmer
Science and technology reporter, BBC News



The Earth's solid inner core is surrounded by a fast-moving
liquid core, giving rise to the planet's magnetic field 


New measurements suggest the Earth's inner core is far hotter than prior experiments suggested, putting it at 6,000C - as hot as the Sun's surface.

The solid iron core is actually crystalline, surrounded by liquid.

But the temperature at which that crystal can form had been a subject of long-running debate.

Experiments outlined in Science used X-rays to probe tiny samples of iron at extraordinary pressures to examine how the iron crystals form and melt.

Seismic waves captured after earthquakes around the globe can give a great deal of information as to the thickness and density of layers in the Earth, but they give no indication of temperature. (...)

Continue reading: http://www.bbc.co.uk/news/science-environment-22297915

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