The heat that keeps the core of the earth molten is primarily radioactive decay -it is what makes rock into liquid lava.

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The research could help test simulations of how the outer, fluid core generates the Earth's magnetic field, which shields our planet and the teeming life on it from harmful cosmic rays.

BBC: NEWS | Science/Nature | Earth's core runs ahead of crust

The inner core, made of very pure, solid iron, rotates along with the outer core, dragging the Earth's magnetic field with them.

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Dr Marcy suspects that his new discovery, which has about 45 times the mass of the Earth, is composed of a rocky core surrounded by a thick envelope of hydrogen and helium gas.

ECONOMIST: Extrasolar planets

The rash of e-cycling legislation in recent years has reinforced natural market forces driven by high prices and limited supplies of core electronic components like platinum and rare earth to promote the nascent industry.

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They constructed levees that, in all but the most extreme circumstances, overcame gravity's force and held back hundreds of millions of tons of water that would otherwise seek a route to the Earth's core via New Orleans.

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They reveal L.Ron's core belief that we're all inhabited with the ghostly remains of dead aliens called Thetans, exiled to planet Earth and then killed by an intergalactic warlord.

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So, its of no surprise, when looking at long term ice core sample and ocean core deposits, they indicate as the Earth warms, so does the carbon footprint from the increase carbon produced high in the atmosphere.

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