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Earth's inner core is the innermost geologic layer of the planet Earth. It is primarily a solid ball with a radius of about 1,220 km (760 mi), which is about 20% of Earth's radius or 70% of the Moon's radius. [1] [2] There are no samples of the core accessible for direct measurement, as there are for Earth's mantle. [3]
Earth's inner core is the innermost geologic layer of the planet Earth. It is primarily a solid ball with a radius of about 1,220 km (760 mi), which is about 19% of Earth's radius [0.7% of volume] or 70% of the Moon's radius. [32] [33] The inner core was discovered in 1936 by Inge Lehmann and is generally composed primarily of iron and some ...
By tracking seismic waves from earthquakes that have passed through the Earth’s inner core along similar paths since 1964, the authors of the 2023 study found that the spin followed a 70-year cycle.
A team at Australian National University (ANU) has found evidence of a new layer to the planet sitting within the inner core. This "innermost inner core" is an iron-nickel alloy ball that, as ...
A USC professor has confirmed what many scientists already believed: Rotation of the solid iron ball at Earth's center is slowing.
Earth's inner core may be rotating at a slightly higher angular velocity than the remainder of the planet, advancing by 0.1–0.5° per year, although both somewhat higher and much lower rates have also been proposed. [133] The radius of the inner core is about one-fifth of that of Earth. The density increases with depth.
Earth's inner core, a super-hot and super-compressed ball of iron smaller than the moon, helps generate the Earth's magnetic field and, by extension, the aurora borealis -- or Northern Lights.
The core contains half the Earth's vanadium and chromium, and may contain considerable niobium and tantalum. [26] The core is depleted in germanium and gallium. [26] Core mantle differentiation occurred within the first 30 million years of Earth's history. [26] Inner core crystallization timing is still largely unresolved. [26]