An underwater volcano near Tonga revealed how sediment spreads, disrupts marine life, and raises questions about deep-sea ...

First came the burnt-match smell of hot sulfur. Then, a roar from below the water. The towering undersea volcano known as Hunga Tonga-Hunga Ha‘apai had awakened, and on a balmy afternoon in ...

The volcano, known as Axial Seamount, is located nearly 1 mile (1.4 kilometers) underwater on a geological hot spot, where searing gushes of molten rock rise from Earth’s mantle and into the crust.