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Earth's Core Blobs: Chemical Interaction May Shed Light On Composition Of Other Planets (Huffington post)
By: Charles Q. Choi, OurAmazingPlanet Contributor
Published: 12/12/2012 01:27 PM EST on OurAmazingPlanet
Metallic blobs that rise from Earth's core might help explain the mysterious
innards of other planets, new research suggests.
Under the outer crust of the Earth sits the rocky mantle layer and then the
planet's metallic, iron-dominated core. Scientists can probe these layers
indirectly by measuring how the speed of seismic waves and electrical signals
change as they zip through them. Analysis of the lowermost mantle in past
studies revealed areas of high electrical conductivity (meaning that electric
signals travel very easily) and low seismic velocity, suggesting that iron
from the outer core was penetrating the mantle.
However, it remained a mystery as to how iron from the core might extensively
chemically interact with the mantle. Known processes for how metal from the
core might infiltrate rock in the mantle were either too slow or too small in
scale to explain the results that researchers saw.
Now a phenomenon discovered by accident and described in the new study in the
Dec. 13 issue of the journal Nature reveals that blobs of iron-rich liquid
from the outermost core might have, over the history of the ...




