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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 ...
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]
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 ...
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]
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 ...
Earth’s inner core, a red-hot ball of iron 1,800 miles below our feet, stopped spinning recently, and it may now be reversing directions, according to an analysis of seismic activity.
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]