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 ...

but according to a new paper in the journal National Science Review, it may have been created when a Mars-sized planet ...

Despite seeming like a relatively stable place, the Earth's surface has changed dramatically ... there are many horizontal layers, which are called strata. The study of strata is called ...

A group of scientists has discovered a hidden layer of molten rock under the Earth’s surface ... has been writing for over a decade, covering science, gaming, and tech culture.