When Ear Spring erupted in September 2018, it dislodged decades of eerie relics, adding a new dimension to the perils of Yellowstone. And clearly they’d been dredged up from somewhere underground before being ejected by the force of the thermal explosion. But what exactly was lurking deep beneath the belly of the park? Photo credit: Yellowstone National Park/Flickr

News coming your way
The biggest news about our planet delivered to you each day