The term 'lahar' refers to a deluge of water, volcanic material and other debris which has been swept along.

In the summer of 1831, strange things began to happen in the skies over Europe and North America. The sun shimmered blue and ...

The 1980 eruption cycle made Mount St. Helens one of the most famous volcanoes in the Cascades. But it is far from the only ...

Mount Etna, the highest active volcano in Europe, erupted on Monday morning, causing a chaotic scene at the popular Italian ...

The largest volcanoes in Earth’s history owe their formation to powerful geological phenomena called mantle plumes—upwellings of abnormally hot rock within the Earth’s mantle that rise toward the ...

The lava flows and ash clouds were probably caused by the collapse of a flank of Etna’s southeast crater, authorities said, ...

The explosion was the strongest since 2021, expelling ash, dust, lava and a pyroclastic flow, but no injuries or deaths were ...

There are currently no active volcanoes in New England, but they did once exist in the region and they created some of the landforms you can see today. The Ossipee Mountains are an example of a “ring ...

Italy's Mount Etna, Europe's tallest volcano, erupted Monday, sending ash and rock into the air. We show you where.

Kirt Kempter likes to tease conservation groups about their efforts to try to stop erosion in the Galisteo Basin. As a geologist, he contextualizes time a bit differently than other people. He knows ...

Can you believe that New Hampshire was once home to active volcanoes? The Lakes Region of New Hampshire, particularly the area surrounding Lake Winnipesaukee, is a landscape defined by its ...

Mount Etna started erupting overnight, with extraordinary footage showing thick plumes of smoke rising from the volcano.