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It has long been known that the inner core of the earth, a sphere consisting of a solid mass with a radius of about 1,200 km, is mainly made up of iron. However, seismic observations have shown that elastic waves pass more rapidly through this core in directions that are parallel to the earth's axis of rotation than in directions parallel to the equator - a phenomenon that has not been previously explained. picked by AutumnLotus 6 months ago tags simulations theory earth core sphere iron |
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