Bolivia has a “zombie” volcano on its hands. Despite being technically dead, Uturuncu in the Central Andes continues to simmer with hints of seismic activity and occasionally belches out plumes of gas. In a new study, scientists have taken a deep look at the anatomy of this undead volcano, hoping to get some insights into its mysterious ways. Uturuncu last erupted 250,000 years ago. There is no strict definition of when a volcano is considered “extinct” or just “dormant,” but a quarter of a million years is a long time, even by volcanic standards. Nevertheless, the volcano is clearly not...