About 1,800 miles beneath the surface, Earth’s internal structure changes abruptly where the solid rock of the mantle meets the swirling molten iron of the outer core. But the boundary between the ...

For decades, schoolbooks have painted a relatively simple picture of Earth’s inner workings—a hard crust, a thick mantle, a swooshing liquid outer core, and a solid inner core at the center. But ...

More insights about Earth's core have arrived through some detailed examinations. A team of researchers believes that the inner core is made of two distinct layers. The finding has been explained in ...