A research team consisted of scientists from different parts of the globe and led by a group of scientists from University of Liverpool’s School of Environmental Sciences has analyzed the magnetic records from ancient igneous rocks. The analyses revealed that the strength level of Earth’s magnetic field was significantly different between 1 billion and 1.5 billion years back.
The theory talks about the presence of a higher magnetic field and points out to the first appearance of solid iron in Earth’s core. The scientists leading the study believe that it was also the time when our planet’s inner core started solidifying and freezing.
It is found that around 4.5 billion years back i.e. before the formation of Earth’s solid inner core, the planet used to be a massive sphere of liquid rock. Scientists say that with time as the surface started to get cooler, the molten mess developed a crust. According to them, the solid core of the planet is a 1 billion old structure, which make sit relatively younger.
The study’s lead author Dr. Andy Biggin said that the findings of this new study might change the way we perceive the layers of our planet and its history. Biggin added that according to the study, the temperature of our planet’s core is dropping at a much slower pace than what we previously believed. According to him, this finding will have a substantial impact on all departments of Earth Sciences.
During the study, Biggin and his team found that the diameter of the Earth’s core increases by 0.04 inches (1 mm) every year. The size of the planet’s inner core right now is similar to that of Pluto.
According to the study team, our planet’s magnetic field, which keeps it protected from harmful solar radiation, is the main reason we have life on Earth. Further research on Earth’s core and its magnetic field will help scientists to predict the planet’s electromagnetic future.
The key findings acquired so far suggest that Earth’s magnetic field and its strong core is capable of staying powerful for another billion years. The data put forward by the study is the exact opposite of similar data about Mars. Mars’ magnetic field was high during its early years but disappeared 4 billion years back.
The entire study was published in the popular science journal Nature on October 7, 2015.