volcanic vent

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• volcanic vent — USGS PHOTO GLOSSARY OF VOLCANIC TERMS See: vent …   Glossary of volcanic terms

• 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 blocks — are fragments of rock which measure more than 64mm in size and are erupted in a solid condition. Blocks are formed from material from previous eruptions or from country rock and are therefore mostly accessory or accidental in origin. Blocks also… …   Wikipedia

• Vent — Vent, n. [OE. fent, fente, a slit, F. fente a slit, cleft, fissure, from fendre to split, L. findere; but probably confused with F. vent wind, L. ventus. See {Fissure}, and cf. Vent to snuff.] 1. A small aperture; a hole or passage for air or any …   The Collaborative International Dictionary of English

• Vent feather — Vent Vent, n. [OE. fent, fente, a slit, F. fente a slit, cleft, fissure, from fendre to split, L. findere; but probably confused with F. vent wind, L. ventus. See {Fissure}, and cf. Vent to snuff.] 1. A small aperture; a hole or passage for air… …   The Collaborative International Dictionary of English

• Vent field — Vent Vent, n. [OE. fent, fente, a slit, F. fente a slit, cleft, fissure, from fendre to split, L. findere; but probably confused with F. vent wind, L. ventus. See {Fissure}, and cf. Vent to snuff.] 1. A small aperture; a hole or passage for air… …   The Collaborative International Dictionary of English

• Vent piece — Vent Vent, n. [OE. fent, fente, a slit, F. fente a slit, cleft, fissure, from fendre to split, L. findere; but probably confused with F. vent wind, L. ventus. See {Fissure}, and cf. Vent to snuff.] 1. A small aperture; a hole or passage for air… …   The Collaborative International Dictionary of English

• Volcanic cone — Puʻu ʻŌʻō, a cinder and spatter cone on Kīlauea, Hawaiʻi Volcanic cones are among the simplest volcanic formations. They are built by ejecta from a volcanic vent, piling up around the vent in the shape of a cone with a central crater. Volc …   Wikipedia

• vent — ALASKA VOLCANO OBSERVATORY GLOSSARY An opening in the Earth s surface through which magma erupts or volcanic gases are emitted. GLOSSARY OF VOLCANIC TERMS A surface opening through which volcanogenic materials are erupted (Davidson and DeSilva,… …   Glossary of volcanic terms

• volcanic glass — a natural glass produced when molten lava cools very rapidly; obsidian. [1830 40] * * * Any glassy rock formed from lava or magma that has a chemical composition close to that of granite. Such molten material may reach very low temperatures… …   Universalium

• vent — vent1 [vent] n [Sense: 1 2, 4; Date: 1500 1600; Origin: VENT2] [Sense: 3; Date: 1400 1500; : Old French; Origin: fente long narrow hole , from fendre to split , from Latin findere; FISSION] 1.) …   Dictionary of contemporary English