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  • 31 January, 2023

  • 5 Min Read

Earth's Inner Core

Earth's Inner Core

  • According to recent research, the Earth's inner core may currently be revolving slower than the planet's surface after having stopped spinning faster than it.


  • In the early 1970s, the inner core began rotating a little bit more quickly than the rest of the planet. However, it had been slowing before synchronizing with Earth's rotation in 2009.
  • A "negative trend" has occurred, which indicates that the inner core is currently revolving more slowly than the surface. The next alteration could happen around 2040.
  • According to the findings, the Earth's deep core typically modifies its rotational speed every 60–70 years.

Reason for rotation:

  • The inner core may rotate on its own because it floats in the outer core's liquid metal.
  • The magnetic field produced by the outer core propels the rotation of the inner core, which is counterbalanced by the mantle's gravitational pull.
  • Through a variety of seismic data, the inner core's rotation is investigated.
  • Oscillation Cycle: The inner core swings back and forth in relation to the Earth's surface; one cycle lasts for roughly seven decades.
  • The planet revolves around the core in the same direction at all times (eastward).
  • It occasionally rotates more quickly than the outer layers, occasionally rotates more slowly, and occasionally the revolutions coincide.
  • Instead of the 70 years that the most recent study suggested, a new study suggested that the inner core cycle occurs every 20 to 30 years.
  • The "length of day" is claimed to be slightly impacted by the variations in the rotation timeline.

About Earth’s Interior:

There are four main layers that make up the interior of the Earth:

  • the crust's outer layer.
  • the solid, viscous mantle beneath it.
  • the outer core of liquid iron-nickel.
  • inner core made of dense iron.

Planet within the planet is the term used to describe Earth's inner core, which is a hot iron ball the size of Pluto.

  • It is around 3,100 miles (5, 000 km) below the crust.

What are the Earth's Three Layers?

  • The crust of the earth is composed primarily of basalt and granite and is the outermost layer of the planet.
  • Mantle: Up to 2900 km thick, it sits underneath the crust. It is made of solid rock that is hot, thick, and rich in iron and magnesium.
  • The liquid outer core and the solid inner core make up the earth's core, which is its central region. Nickel, iron, and molten rock make up the outer core.

Source: The Indian Express

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