A new theory of Earth’s core began solidifying

In the beginning, scientists believe there was an interstellar gas cloud of all the elements

the Earth was a globe of concentric spheres with a solid iron inner core

The current theory is that the primeval cloud’s materials accreted 

the iron, melted by radioactive heating, sank toward the center of the globe

Most scientists now agree that the core formed as materials that make up Earth collided 

The planet’s heart is primarily made of iron, nickel and some oxygen,

Recently, scientists proposed the inner core could be superionic,

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