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Now, in another surprising study, a team of researchers think they have figured out why Earth's solid iron core is a tad softer than expected: its atoms might move.
, more like soft metals such as lead and closer to molten iron than the solid lump we may have been picturing in our minds. Like people changing seats at a dinner table, the iron atoms migrate to neighboring positions without disturbing the underlying metallic structure of the iron, which makes the core more malleable, Zhang and colleagues suggest.
Prior to this, scientists had simulated Earth's inner core using computer models that tended to capture fewer than a hundred atoms arranged in a repeating hexagonal structure.that melt pockets within Earth's inner core may explain some of its observed properties., and no theory has as yet comprehensively explained the strange suppleness of Earth's inner orb.
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