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outer core–inner core boundary. 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 ...
The transition between the inner core and outer core is located approximately 5,150 km (3,200 mi) beneath Earth's 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.
The outer core of Earth is liquid, unlike its inner core, which is solid. [5] Evidence for a fluid outer core includes seismology which shows that seismic shear-waves are not transmitted through the outer core. [6] Although having a composition similar to Earth's solid inner core, the outer core remains liquid as there is not enough pressure to ...
It is divided into a solid inner core, with a radius of 1220 km, and a liquid outer core. [55] The motion of the liquid in the outer core is driven by heat flow from the inner core, which is about 6,000 K (5,730 °C; 10,340 °F), to the core-mantle boundary, which is about 3,800 K (3,530 °C; 6,380 °F). [56]
The mysterious region where the liquid outer core envelops the solid inner core is especially interesting, Vidale added. As a place where liquid and solid meet, this boundary is “filled with ...
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.
A planetary core consists of the innermost layers of a planet. [1] Cores may be entirely liquid, or a mixture of solid and liquid layers as is the case in the Earth. [2] In the Solar System, core sizes range from about 20% (the Moon) to 85% of a planet's radius (Mercury). Gas giants also have cores, though the composition of these are still a ...
“We infer the inner core rotation changes direction every 35 years,” Dr. Song told McClatchy News. ... The inner core can spin independently because it is encased in a liquid outer core, ...