Volcanoes erupt explosively when gas-charged magma reaches Earth's surface. The formation and growth of gas bubbles are complex processes that fascinate nearly every volcanologist. There are ...

Is it possible that a volcano can erupt with no previous signs? Fiske: If a volcano is monitored instrumentally, it is very unlikely that any major eruption could occur without any previous ...

Volcanoes don't all erupt explosively, and while scientists have long realized that the type of magma affects the eruption, new research is showing heat is also driving the kaboom.

Mount Merapi is expected to erupt at any moment, and Indonesian officials have begun to evacuate people living near the volcano.