Lava tubes form when a lava stream cools and forms a hardened exterior ... lunar lava tubes could have existed," Carrer said.

Deep within Africa’s Great Rift Valley, Virunga National Park is home to some of the continent’s most active volcanoes, ...

These spatter fountains continued to increase in intensity, and by 6 :35 p.m. Thursday, spattering could be seen on the streaming webcam. The spattering increased overnight—and lava erupted from ...

YOGYAKARTA, Indonesia--Indonesia’s most volatile volcano erupted Friday, releasing plumes of ash high into the air and sending streams of lava with searing gas clouds flowing down its slopes.