Japanese scientists say that silicon is likely the mystery element in the Earth's inner core, claiming progress on solving one of the planet's deepest secrets. Consensus has long been that the centre of the planet is composed of about 85 percent iron and 10 percent nickel, with sulphur, oxygen and silicon prime candidates for the other five percent. But geophysicist Eiji Ohtani at Tohoku University in northern Japan and his research team suggest that silicon is the most likely candidate.
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