which can flow more than 60 miles per hour. During the 2002 eruption, swaths of lava up to 165 feet wide tore down Nyiragongo's slopes, burning everything in their path. Tephra is a general term ...

In a remote corner of the U.S., active volcanoes wait patiently above the ridgelines, leaving residents on edge.

tephra and pyroclastic-flow deposits),” Phivolcs explained on its website. In a separate advisory, Phivolcs said Taal Volcano emitted 1,113.3 tons of sulfur dioxide on Monday, January 20.