Crust and mantle
Monday, December 26, 2005 3:30:39 PM
Earth's future was determined at birth. Using refined techniques to study rocks, researchers at the Carnegie Institution's Department of Terrestrial Magnetism found that Earth's mantle -- the layer between the core and the crust -- separated into chemically distinct layers faster and earlier than previously believed. The layering happened within 30 million years of the solar system's formation, instead of occurring gradually over more than 4 billion years, as the standard model suggests. The new work was recognized by Science magazine, in its December 23 issue, as one of the science breakthroughs for 2005.
http://www.physorg.com/news9299.html
See also http://whatonearth.olehnielsen.dk/interior.asp
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