The core of the earth has melted and solidified

Researchers at the University of Leeds, San Diego and the Indian Institute of Technology say the Earth's inner core is melting and freezing and is due to thermal circulation in the outer coating.

This discovery was published in Nature 19/5.

Explaining the study, Dr Jon Mound of Leeds University said "The origin of Earth's magnetic field is still a mystery to the scientific community. We cannot get samples from the center of the Earth, so we must Based on surface measurement and computer modeling to know what's happening inside the Earth core ".

Dr. Mound said the team's model provides a fairly simple explanation whereby the entire force of the Earth's core is in some way linked to plate tectonics.'If our model is verified, it will be a big step towards understanding the formation of the Earth's inner core, while helping to understand how the Earth's core arises from the field ,' Mound said. to speak.

Earth Structure (Photos: Clearclouds )

The inner core of the Earth is a molten iron ball. This ball is surrounded by an outer core of liquid iron-nickel alloy and a number of other light elements, followed by a viscous coating and the outermost layer of the solid surface where we live. For billions of years, the Earth has been cold inside and out, causing the iron core to melt in part and solidify. The core in the Earth grows at a rate of 1mm / year when iron forms a solid mass.

The temperature when the cold core passes from the core emits the coating to the crust called the convection process. Like a pan of boiling water on a stove, convection currents transfer the warm coating to the surface and bring the cold coating towards the core. This makes it escape and also causes the Earth to arise from the school.

Recently, scientists began to realize that the core in the Earth could melt as well as freeze, but there is still a lot of controversy about the cold process going deep inside the Earth. Now, researchers believe they have explained the mystery.

By using a computer model of external core coherence combined with seismic data, they show that the heat flow at the boundary of the core and coating varies depending on the structure of the coating. In some areas, it may happen that the temperature does not escape the coating but turns back into the core causing local melting.

The model shows that a layer of oceanic tectonics is submerged into the coating.

The model also shows that underneath seismic activity areas around the Pacific "ring of fire", ocean tectonics are drawn into the coating to absorb a lot of heat from the core. This further cools the coating and generates a cold flow of material flowing through the outer core and coagulating at the inner core.

In contrast, in two large regions below Africa and the Pacific where the thinnest coating is hotter than normal, less heat emits from the core. The outer core below these areas is hot enough to melt back the inner core.

Dr. Sebastian Rost of Leeds University said, " The model allows us to explain some seismic measurements that once showed that there is a solid liquid around the inner core. Local melting theory can help explain. Other seismic observations, for example: why seismic waves from earthquakes spread faster in some parts of the core than others. "