What he and others uncovered involves magma, as so many of the planet’s best spots do. Roughly 4km below the Cave of Crystals ...

The cavern, which is made of limestone, sits above a magma reservoir buried three to five kilometres (two to three miles) beneath Naica, and is also on a faultline. Its crystals were formed when ...

A seismic survey challenges the long-standing belief that only active volcanoes have large magma bodies sitting beneath them. A research team used seismic waves to characterize magma chambers ...