A gigantic bulge in the north rim of the Yellowstone caldera is the latest sign of volcanic activity in the national park.

Volcanoes are grouped into four types: cinder cones, composite volcanoes, shield volcanoes and lava volcanoes. Cinder cones are circular or oval cones made up of small fragments of lava from a single ...

Most volcanoes form at the boundaries of Earth's tectonic plates, which are huge slabs of crust and upper mantle that fit together like puzzle pieces. Think of these plates as massive rafts floating ...

Volcanic eruptive activity may take many forms, from gently erupting basaltic fissures in Hawaii to intense explosive eruptions like those of Mount St. Helens. Volcano observatory scientists are ...

Effusive eruption at Mayon Volcano in Albay continues, and is now on its 22nd straight day. In its summary of 24-hour ...

Volcanoes are one of nature’s most awe-inspiring creations, giant mountains ejecting red hot lava that are both beautiful and deadly. We recently explored why volcanoes are so astounding, but, did you ...

Studies reveal that beneath seemingly tranquil mountains, magma boils in shallow layers, reducing volcanic warning time.

Iceland became the focus of many this past week as one of its many volcanoes erupted. Photos and videos mesmerize as they show fountains of lava spewing from the ground and thick plumes of smoke ...