For decades, noble gases like helium have been considered chemically ... Until now, researchers believed that helium was stored in the mantle, trapped in ancient rock formations.

Earth’s core could contain helium from the early solar system. The noble gas tucks into gaps in iron crystals under high pressure and temperature.

Noble gases including helium are normally chemically inert ... which originally derives from hot plumes coming from deep within Earth’s mantle.” The mantle is the region between Earth’s core and crust ...