A volcano is a rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface. Earth's volcanoes occur because its crust is broken into 17 major, rigid tectonic plates that float on a hotter, softer layer in its mantle. Therefore, on ...
A volcano is a mountain that opens downward to a reservoir of molten rock below the surface of the earth. Unlike most mountains, which are pushed up from below, volcanoes are vents through which molten rock escapes to the earth's surface. When pressure from gases within the molten rock becomes too great, an ...
Get more information about volcanoes from National Geographic.
A new documentary video about Kīlauea Volcano in Hawai'i, with behind-the- scenes imagery of publicly inaccessible areas, is available from the U.S. Geological Survey's Hawaiian Volcano Observatory. Through historical photos of past Halema'uma'u eruptions and stunning 4K imagery of the current eruption, this ...
Cleveland volcano (Aleutian Islands, Alaska): explosion recorded today, ash to 20,000 ft altitude. Wednesday, Dec 13, 2017. The Alaska Volcano Observatory ( AVO) raised the aviation alert level of the volcano back to orange after an explosion was detected from the volcano this morning 04:20 AKST local time (13: 20 UTC).
In this educational animated movie about Science learn about eruptions, ashes, cinders, sub-ducts, lava, magma, geyser, tectonics, Pompeii, Helens, Hawaii, and disasters.
The Global Volcanism Program (GVP) seeks better understanding of all volcanoes through documenting their eruptions--small as well as large--during the past 10000 years. The range of volcanic behavior is great enough, and volcano lifetimes are long enough, that we must integrate observations of contemporary activity ...
This interactive exhibit, part of the Exhibits Collection, explores why volcanic eruptions occur. Activities in the exhibit invite visitors to melt rocks, locate famous volcanoes and play the role of a volcanologist. The exhibit also includes video clips and related Web sites of interest.