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The density of the inner core is believed to vary smoothly from about 13.0 kg/L (= g/cm 3 = t/m 3) at the center to about 12.8 kg/L at the surface.
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 ...
The Earth has a 5–10% mass deficit for the entire core and a density deficit from 4–5% for the inner core. [26] The Fe/Ni value of the core is well constrained by chondritic meteorites. [26] Sulfur, carbon, and phosphorus only account for ~2.5% of the light element component/mass deficit. [26]
The new inner core is made up of about 400 miles of dense iron. Researchers believe they’ve discovered Earth’s even smaller inner core. The new inner core is made up of about 400 miles of ...
The solid, high-density composition of the inner core, predominantly iron and nickel, results in increased seismic velocity compared to the liquid outer core. [44] While light elements also present in the inner core modulate this velocity, their impact is relatively contained. [45]
This "innermost inner core" is an iron-nickel alloy ball that, as professor Hrvoje Tkalčić explains, is a "fossilized record" of Earth's ancient history. Until now, science had only recognized ...
Earth's density varies considerably, between less than 2700 kg/m 3 in the upper crust to as much as 13 000 kg/m 3 in the inner core. [13] The Earth's core accounts for 15% of Earth's volume but more than 30% of the mass, the mantle for 84% of the volume and close to 70% of the mass, while the crust accounts for less than 1% of the mass. [13]
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. Among the Solar System ...