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| New ideas for how Earth core formed |
Full story at link. One implication I found interesting is that studying meteorite composition may not indicate the bulk composition of the Earth. Brian
By Simon Redfern Science reporter, BBC News Filaments of iron link up in a network that allows metal to flow to the core deep in the Earth Filaments of iron link up in a network that allows metal to flow to the core deep in the Earth. Experiments on samples of iron and rock held at immense pressures have led to new ideas of how Earth's core formed. Scientists from Stanford University have shown that iron metal will flow through rocks 1,000km beneath our feet. Using sophisticated X-ray imaging, they watched molten metal moving through rocks, squeezed to huge pressures between the tips of pairs of diamonds. Their results suggest that Earth's core did not form in a single step, but grew in a complicated sequence over time. |
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