An academic research reveals slowing down of Earth’s inner core Rotation to a point where its moving backwards. The findings asserts that our inner core’s spin is not constant; instead, it might be slowing down. Its slowing down may have profound implications for our planet.

• It may fractionally shorten the length of the day.
• It may potentially affect Earth’s Magnetic field. It is a protection shield that safeguards the planet from deadly Solar radiation.

LEARNING WITH TIMES /WITHOUT CLASSES/ BASICS

Danish seismologist Inge Lehmann in 1936 discovered Earth’s inner core  . As the inner core is inaccessible  due to depth scientist discovers its feature by examining seismic waves during earthquakes.

INNER CORE

The Earth comprises four basic layers: a solid crust, a hot, nearly solid mantle, a liquid outer core, and a solid inner core. The lithosphere is crust and the uppermost part of the mantle .The core-mantle boundary lies at a depth of 2,900 km. The lithosphere isn’t a continuous piece that covers around the whole Earth like an eggshell.It’s actually made up of giant tectonic plates.

Plate tectonics  theory says that Earth’s outer shell is divided into large slabs of solid rock, called  “plates,”.  Plates drift over Earth’s mantle, the rocky inner layer above Earth’s core. Below the lithosphere is the asthenosphere — a viscous layer kept malleable by heat deep within the Earth. It lubricates the undersides of Earth’s tectonic plates, allowing the lithosphere to move around. 

The seven major plates are the North American, Pacific, Eurasian, African, Indo-Australian, South American, and Antarctic tectonic plates.

An earthquake is the result of a sudden release of energy, an intense shaking of Earth’s surface, in
the Earth’s crust that creates seismic waves. 

the earthquake produces three main types of waves  : Primary waves or P, Secondary waves
or S and Long waves or surface waves or L.

               L waves produces most of the the destruction caused by an earthquake. P and S waves in the study of earth’s interior.

                   The  P waves travel fastest and first to reach seismic station, and after that the S waves which are the slowest arrive. P wave is a longitudinal wave: in which the particle displacement is parallel to the direction of wave propagation. P wave called compression-dilation. Like the sound waves, the P waves pass through solids, liquids, and gases alike.

          
                   The S waves are Transverse waves: the particle displacement is perpendicular to the direction of wave propagation. The S waves pass through only solids.