The interior of our planet, Earth, is layered like an onion, with the iron-nickel core at the centre, a surrounding thick layer - the mantle - and on top of. 27.05.2022, Sputnik International
If subduction carries hydrous minerals deep into Earth's mantle, they may "rust" the iron outer core, forming vast sinks of oxygen that can later be returned to the atmosphere. Iron on Earth's surface whether in simple nails or mighty girders .