What is the chemical composition of the Earth’s interior? Because it is impossible to drill more than about ten kilometres deep into the Earth, volcanic rocks formed by melting Earth’s deep interior ...

Earth’s surface environment hosts large reservoirs of hydrogen (H, mainly in the form of water, H2O), nitrogen (in atmospheric N2) and carbon (mainly in carbonate rocks). H, N and C are sometimes ...

(Rost-9D/iStock/Getty Images Plus) The Earth is akin to a rocky, molten-in-the-middle nesting doll – or perhaps a rotting, ...

Geophysicists at ETH Zurich are using models of the lower mantle to identify areas where earthquake waves behave differently than previously assumed. This indicates the presence of zones of rocks that ...

While Earth's core consists mostly of iron, its density implies that lighter elements are also mixed in. Because hydrogen is ...