A lahar, which is essentially a mudflow filled with rock particles, can reach speeds as high as 120 miles per hour.
"There are injured, burned and dead people."
A tide of molten rock has turned residential streets in Hawaii into a volcanic wasteland as residents flee a surge of lava heading towards them.
The first report of an eruption-related injury from the active Kilauea volcano in Hawaii occurred Saturday after a homeowner's lower leg was "shattered" by a "lava bomb."
Beautiful, but dangerous.
Scientists have never been able to separate the sound of thunder from the rest of an eruption's clatter.
The crystals carry a memory of environmental changes the way trees do with their rings.
The volcano has the potential to turn deadly.
The concern surrounds volcanoes in the U.S., Mexico, Japan and elsewhere.
"Man, the changes would be so much bigger than anything we've ever seen."
Using a network of thousands of monitors, geologists realized New England isn't as peaceful as it looks.
Indonesia's Disaster Mitigation Agency set up an exclusion zone and ordered people to "immediately evacuate."
And someday soon, we're going to regret it.
When it comes to eruptions, everything is unpredictable.
At the time, volcanoes in Iceland were erupting 50 times more often than today.
"The research did not analyze the likelihood that another supereruption at Yellowstone would occur. Period."