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 ...

The Earth is made up of different layers: Therefore, instead of tectonic plates moving because of the convection currents, evidence suggests it is the plates that drive the convection. Slab pull ...

Deep within Earth, there lies a mysterious layer called the D" layer ... According to the new model, minerals in D" would be dominated by a new assemblage: the iron-poor silicate, iron-rich ...

so scientists rely on seismic waves to understand and model its structure. Seismic waves are shock waves that propagate through Earth's layers after an earthquake or explosive event, traveling at ...