Earth's core isn't static, but changes shape (and scientists are beginning to understand why)
For years, we have imagined Earth's center as immobile: a compact, silent sphere hidden under thousands of miles of rock and molten metals. In textbooks, Earth's inner core is often described as a solid, stable mass, almost as if it had crystallized over time. A fixed point in a planet that on the surface, on the contrary, never stops changing.
