MANILA, PHILIPPINES — Researchers at Ateneo de Manila University in Quezon City and National University—Mall of Asia Campus ...

Want to add some heat to your hikes? Try these six active volcano hikes, from Japan to Italy to Guatemala and everywhere in between.

Lahars or debris flows: This term describes a hot or cold slurry of water and rock fragments that rushes down a volcano’s slopes like “rivers of concrete,” according to the USGS. These often ...