Earth's solid iron core formed a BILLION years ago and is still growing

3.1 Earth's Layers: Crust, Mantle, and Core – Physical Geology, First University of Saskatchewan Edition

Asal Usul Bahan Tambang di Muka Bumi, by HMT-ITB

Earth's Inner Core is Around 1.15 Billion Years Old, Study Shows

Is Earth's core lopsided? Strange goings-on in our planet's interior

Swirls of liquid iron may be trapped inside Earth's 'solid' core

Asal Usul Bahan Tambang di Muka Bumi, by HMT-ITB

Earth Core - an overview

Crushing Pressures Start to Reveal the Truth About Earth's Core, Science

Something very weird is happening inside Earth's core

Earth's core is wilder than you can imagine