The Earth's inner core is thought to be slowly growing as the liquid outer core at the boundary with the inner core cools and solidifies due to the gradual cooling of the Earth's interior (about 100 degrees …

Jun 5, 2025 · As the entire Earth slowly cools, the inner core grows by about a millimeter every year. The inner core grows as bits of the liquid outer core solidify or crystallize.

Jan 9, 2026 · Discover how Earth’s most inaccessible layer, the solid inner core, generates the magnetic shield that protects life on the surface.

Mar 30, 2025 · Earth’s interior can be divided into several layers: the crust, the mantle, the liquid outer core, and the solid inner core at the center. Many scientists have studied how the inner core moves …

Mar 30, 2025 · Nestled over 3,000 miles beneath the Earth’s surface, the inner core is a solid sphere primarily composed of iron and nickel. Despite its relatively small size— smaller than the Moon —it …

Sep 17, 2025 · But despite its importance, many of the most fundamental properties of the core are unknown. We do not know exactly how hot the core is, what it is made of or when it began to freeze.

Jul 21, 2025 · We now enter the Earth’s core, which consists of two parts: the outer core, a molten sea of iron and nickel; and the inner core, a dense, solid ball of mostly iron that spins within it.

The inner core is the solid, innermost layer of the Earth, composed primarily of iron and nickel. It is situated beneath the outer core and extends from about 5,150 kilometers to the Earth's center at …

Feb 12, 2025 · A new study published Monday in the journal Nature Geoscience found evidence that the Earth’s inner core —a hot, mostly solid ball of iron roughly 1,500 miles wide —deforms at its boundary...

Buried more than 3,000 miles beneath our feet, Earth’s solid inner core was once thought to be unchanging—locked in place at the heart of the planet. But new research has revealed something …