volcanic eruption

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• volcanic eruption — ugnikalnio išsiveržimas statusas T sritis ekologija ir aplinkotyra apibrėžtis Žemės gelmių energijos sukeliamas reiškinys, kai magma, veikiama tam tikrų tektoninių procesų arba slegiama iš jos apačios staiga išsiskiriančių vandens garų, dujų,… …   Ekologijos terminų aiškinamasis žodynas

• volcanic eruption — noun the sudden occurrence of a violent discharge of steam and volcanic material (Freq. 1) • Syn: ↑eruption • Derivationally related forms: ↑erupt (for: ↑eruption) • Hypernyms: ↑ …   Useful english dictionary

• Eruption column — over Mount Pinatubo in the Philippines An eruption column consists of hot volcanic ash emitted during an explosive volcanic eruption. The ash forms a column rising many kilometres into the air above the peak of the volcano. In the most explosive… …   Wikipedia

• Volcanic ash — consists of small tephra, which are bits of pulverized rock and glass created by volcanic eruptions,United States Geological Survey. [http://volcanoes.usgs.gov/Hazards/What/Tephra/tephra.html Tephra: Volcanic Rock and Glass Fragments.] Retrieved… …   Wikipedia

• Volcanic rock — is an igneous rock of volcanic origin. Texture Volcanic rocks are usually fine grained or aphanitic to glassy in texture. They often contain clasts of other rocks and phenocrysts. Phenocrysts are crystals that are larger than the matrix and are… …   Wikipedia

• Volcanic gas — Volcanic gases include a variety of substances given off by active (or, at times, by dormant) volcanoes. These include gases trapped in cavities (vesicles) in volcanic rocks, dissolved or dissociated gases in magma and lava, or gases emanating… …   Wikipedia

• Eruption (disambiguation) — Eruption can refer to: *Volcanic eruption *Tooth eruption, the emergence of teeth through the gum *Eruption (band), a British disco/R B band in the 1970s and 1980s *Eruption (German band), a short lived German experimental band *Eruption (album) …   Wikipedia

• Volcanic winter — A volcanic winter is the reduction in temperature caused by volcanic ash and droplets of sulfuric acid obscuring the sun and lowering the albedo (increasing the Earth s reflectivity), during a large particularly explosive type of volcanic… …   Wikipedia

• Volcanic Explosivity Index — The Volcanic Explosivity Index (VEI) was devised by Chris Newhall of the U.S. Geological Survey and Steve Self at the University of Hawaiokinai in 1982 to provide a relative measure of the explosiveness of volcanic eruptions. Volume of products,… …   Wikipedia

• eruption cloud — ALASKA VOLCANO OBSERVATORY GLOSSARY Cloud of gas, ash, and other fragments that forms during an explosive volcanic eruption and travels long distances with the prevailing winds. USGS PHOTO GLOSSARY OF VOLCANIC TERMS A cloud of tephra and gases… …   Glossary of volcanic terms

• Volcanic plume — A volcanic plume can refer to:* An eruption column of hot volcanic ash and gas emitted into the atmosphere during an explosive volcanic eruption. * A mantle plume, an upwelling of abnormally hot rock within the mantle which can cause volcanic… …   Wikipedia