So, I've had requests on the blog to help to do some defining of volcanologic terms on the blog, so I thought I'd try a new column called Eruptions Word of the Day. I'm not sure how often it will run, ...

Lava flows from a fissure in the aftermath of eruptions from the Kilauea volcano on Hawaii's Big Island, May 22, 2018. Andrew Richard Hara/Ena Media Hawaii via Getty Images But not all lavas are the ...

block: a solid rock fragment greater than three inches in diameter that is ejected from a volcano during eruption bomb: a partially molten lava fragment greater than three inches in diameter that is ...

Lassen Peak in California, seen in October 2008. Image: Erik Klemetti So, I'm off to the American Geophysical Union Fall Meeting in San Francisco meeting tomorrow. This year, I will be presenting on ...

Receive emails about upcoming NOVA programs and related content, as well as featured reporting about current events through a science lens. There are many different kinds of volcanoes, ranging from ...

Volcanos are releasing ash and smoke into the atmosphere on three continents. That might be making you think back to your elementary school science class when you probably studied volcanoes and lava.

A crew drilling on the Big Island of Hawaii has discovered magma, the molten rock material -- never before found in its natural habitat underground -- that is the central ingredient in the evolution ...

Click on the image to see a larger version. Dissected with lava flow and pyroclastic deposit layering along with magmatic dikes exposed. The original flow features are rarely preserved and the volcano ...

Although MSH erupted explosively on 18 May1980, dome-building activity that began in 2004 is consistent with the volcano’s recent geologic history 4. Over the past ∼4,000 yr, MSH has extruded rock at ...