volcanic ejecta

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• 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 —   Pele, a ā pele.     Volcanic flow, lua i pele, ā pele.     Volcanic ejecta, pōhāhā.     Volcanic haze, noeuahi …   English-Hawaiian dictionary

• Volcanic pipe — Volcanic pipes are geological structures formed by the violent, supersonic eruption of deep origin volcanoes. They are considered to be a type of diatreme . Volcanic pipes are composed of a deep, narrow cone of solidified magma (described as… …   Wikipedia

• Ejecta — can mean: *In volcanology, particles that came out of a volcanic vent, traveled through the air or under water, and fell back on the ground surface or on the ocean floor. Ejecta can consist of: *# Juvenile particles (fragmented magma and free… …   Wikipedia

• 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

• 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

• Volcanic Explosivity Index — USGS PHOTO GLOSSARY OF VOLCANIC TERMS The Volcanic Explosivity Index, or VEI, was proposed in 1982 as a way to describe the relative size or magnitude of explosive volcanic eruptions. It is a 0 to 8 index of increasing explosivity. Each increase… …   Glossary of volcanic terms

• Volcanic crater — A volcanic crater is a circular depression in the ground caused by volcanic activity. [cite web url=http://www.physicalgeography.net/physgeoglos/c.html title=Glossary of Terms: C publisher=www.physicalgeography.net accessdate=2008 04 12] It is… …   Wikipedia

• Volcanic bomb — A volcanic bomb is a globe of molten rock (tephra) larger than 65 mm (2.5 inches) in diameter, formed when a volcano ejects viscous fragments of lava during an eruption. They cool into solid fragments before they reach the ground. Lava bombs can… …   Wikipedia

• ejecta — [ɪ dʒɛktə] plural noun [often treated as sing.] Geology & Astronomy material that is forced or thrown out, in particular as a result of volcanic eruption or meteoritic impact. Origin C19: from L., things thrown out , neut. plural of ejectus, from …   English new terms dictionary

• Geology of the Lassen volcanic area — The geology of the Lassen volcanic area presents a record of sedimentation and volcanic activity in the area in and around Lassen Volcanic National Park in Northern California, U.S.. The park is located in the southernmost part of the Cascade… …   Wikipedia