The outer core is liquid iron and nickel and generates the Earth's magnetic field. And the inner core is made of solid iron and nickel. The surface of the earth is constantly changing. It's the ...

That iron ball — Earth's inner core — may have recently stopped rotating, then reversed direction for no apparent reason, a new study found. That may sound apocalyptic, but don't worry.

The Earth's interior is composed of four layers, three solid and one liquid—not magma but molten metal, nearly as hot as the surface of the sun. The deepest layer is a solid iron ball ...

All organisms on Earth ride upon a "ferrous wheel" made of different forms of iron that are essential for life. Aa Aa Aa Biogeochemical cycles describe pathways by which chemical elements move ...