A long quiet volcano in Ethiopia has roared back to life, blasting ash roughly 9 miles into the sky and catching both nearby ...

The explosiveness of a volcanic eruption depends on how many gas bubbles form in the magma – and when. Until now, it was thought that gas bubbles were formed primarily when the ambient pressure ...

One of the most explosive volcanoes in U.S. history began its eruption with a trickle, not a blast. Mount St. Helens' gas-laden magma oozed into the cone before the mountain finally erupted in 1980.

Deep in the south Pacific Ocean, near the remote Solomon Islands, there’s a volcano unlike any other on earth. For one, it’s underwater; and secondly, it’s extremely active. Kavachi, it’s called. And ...

Popocatépetl emerged in the crater of other volcanoes in its current form more than 20,000 years ago and has been active ...