Scientists identify a six-year cycle of super-and sub-rotation that affected the length of a day based on their analysis of seismic data.
Earth’s structure is divided into layers, with the inner core at the center followed by the outer core, lower mantle, upper mantle, crust, and atmosphere. The inner core is the hottest part of the planet at about 10,000 °F (5400 °C), which is similar to the temperature of the surface of the sun!
Believed to consist mostly of an iron-nickel alloy.
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