On volcanoes, a fissure is an elongated fracture or crack at the surface from which lava erupts. Fissure eruptions typically dwindle to a central vent after a period of hours or days. Occasionally ...

Lava flows are masses of magma that pour onto the Earth's surface during an eruption; they include both moving lava and the resulting solidified deposits of black rock. Lava flows come in a great ...

STOCKHOLM (Reuters) - A small new fissure eruption in an ice-free area of Iceland's Bardarbunga volcano system prompted authorities to raise their warning of the risk of ash to aviation to the ...