Dome-building eruptions are common, particularly in convergent plate boundary settings. Lava definition is - molten rock that issues from a volcano or from a fissure in the surface of a planet (such as earth) or moon; also : such rock that has cooled and hardened In volcanology, a lava dome is a circular mound-shaped protrusion resulting from the slow extrusion of viscous lava from a volcano. A daily challenge for crossword fanatics. Felsic (or silicic) lavas such as rhyolite and dacite typically form lava spines, lava domes or "coulees" (which are thick, short lavas) and are associated with pyroclastic (fragmental) deposits. You're signed out. These surface features are due to the movement of very fluid lava under a congealing surface crust. This is typical of many shield volcanoes. Lava deltas are generally associated with large-scale, effusive type basaltic volcanism. The lava from these lakes occasionally overflows on to the volcano’s south side. Astuce: parcourir les champs sémantiques du dictionnaire analogique en plusieurs langues pour mieux apprendre avec sensagent. Many of the largest volcanoes on Earth are shield volcanoes. The term lava flow is commonly shortened to lava. Delivered to your inbox! The lava cools and breaks up as it encounters the water, with the resulting fragments filling in the seabed topography such that the sub-aerial flow can move further offshore. The eruptions of lava are sometimes attended by peculiarities which impart to them much additional grandeur. Four types of unusual volcanic rocks have been recognised as erupting onto the surface of the Earth: The term "lava" can also be used to refer to molten "ice mixtures" in eruptions on the icy satellites of the Solar system's gas giants[13]. It also issues from fissures in the earth's surface, and forms beds covering many square miles, as in the Northwestern United States. Lava definition: Lava is the very hot liquid rock that comes out of a volcano. The centre of a lava flow is commonly massive and crystalline, flow banded or layered, with microscopic groundmass crystals. Beneath this crust, which being made of rock is an excellent insulator, the lava can continue to flow as a liquid. a mountain or hill, usually having a cuplike crater at the summit, formed around such a vent from the ash and lava expelled through it. Highly viscous lava shows the following behaviors: Highly viscous lavas do not usually flow as liquid, and usually form explosive fragmental ash or tephra deposits. Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free! There are only a few sites in the world where permanent lakes of lava exist. The volcano hosts a … View on Wikipedia. These example sentences are selected automatically from various online news sources to reflect current usage of the word 'lava.' ○   Lettris Lava lakes do not usually persist for long, either draining back into the magma chamber once pressure is relieved (usually by venting of gases through the caldera), or by draining via eruption of lava flows or pyroclastic explosion. Les jeux de lettre français sont : Higher iron and magnesium tends to manifest as a darker groundmass, and also occasionally amphibole or pyroxene phenocrysts. Unlike shield volcanoes, with low-viscosity lava, the magma from volcanic domes just pile up over and around the vent forming up into a dome, which may grow by inflating from the inside or … Volcano, vent in the crust of Earth or another planet or satellite, from which issue eruptions of molten rock, hot rock fragments, and hot gases. When first erupted from a volcanic vent, lava is a liquid at temperatures from 700 °C to 1,200 °C (1,300 °F to 2,200 °F). It flows out in streams sometimes miles in length. Mount Nyiragongo is an active stratovolcano that has an elevation of 11380 feet. The rock formed by the cooling and solidifying of molten rock. Copyright © 2000-2016 sensagent : Encyclopédie en ligne, Thesaurus, dictionnaire de définitions et plus. At this temperature there is no polymerization of the mineral compounds, creating a highly mobile liquid with viscosity as low as that of water. New lava flows will cover the surrounding land, isolating the kīpuka so that it appears as a (usually) forested island in a barren lava flow. ‘Variations in composition within each series reflect differentiation in magma chambers under volcanoes.’ The loose, broken, and sharp, spiny surface of an ʻaʻā flow makes hiking difficult and slow. Igneous rocks, which form lava flows when erupted, can be classified into three chemical types; felsic, intermediate, and mafic (four if one includes the super-heated ultramafic). The thickness of a basalt lava, particularly on a low slope, may be much greater than the thickness of the moving lava flow at any one time, because basalt lavas may "inflate" by supply of lava beneath a solidified crust. Ajouter de nouveaux contenus Add à votre site depuis Sensagent par XML. A shield volcano have a broad profile is built up over time by flow after flow of relatively fluid basaltic lava issuing from vents or fissures on the surface of the volcano. 2. The definition of a volcano is a rupture in the Earth's crust where molten lava, hot ash, and gases from below the Earth’s crust escape into the air. A pāhoehoe flow typically advances as a series of small lobes and toes that continually break out from a cooled crust. Accessed 29 Mar. noun volcanoes, volcanos 1 A mountain or hill, typically conical, having a crater or vent through which lava, rock fragments, hot vapour, and gas are or have been erupted from the earth's crust. a hard and coarse basaltic millstone from the neighborhood of the Rhine. 'Nip it in the butt' or 'Nip it in the bud'. Italian, ultimately from Latin labes fall; akin to Latin labi to slide — more at sleep, A game (and meme) in which players must avoid touching the floor.  | Privacy policy Although lava is quite viscous, with about 100,000 times the viscosity of water, it can flow great distances before cooling and solidifying, because of both its thixotropic and shear thinning properties.[1][2]. Elles se solidifient rapidement par refroidissement au contact du sol, de latmosphère ou de leau et forment alors des roches volcaniques, comme les basaltes ou les rhyolites. Volcanic ash deposits on a parked McDonnell-Douglas DC-10-30 during the 1991 eruption of Mount Pinatubo, causing the aircraft to rest on its tail.While falling ash behaves in a similar manner to snow, the sheer weight of deposits can cause serious damage to buildings and vehicles, as seen here, where the deposits were able to cause the 120 ton airliner's centre of gravity to shift. One of the major reasons behind the volcanic eruption is due to the pressure that is created due to the dissolved gases. The crystal size at the centre of a lava will in general be greater than at the margins, as the crystals have more time to grow. Lava tubes are known from the modern day eruptions of Kīlauea, and significant, extensive and open lava tubes of Tertiary age are known from North Queensland, Australia, some extending for 15 kilometres. It. Molten rock that reaches the earth's surface through a volcano or fissure. Définition volcano | dictionnaire anglais définition synonymes Reverso. Definition of lava flow. It also issues from fissures in the earth's surface, and forms beds covering many square miles, as in the Northwestern United States. Ultramafic lavas such as komatiite and highly magnesian magmas which form boninite take the composition and temperatures of eruptions to the extreme. However, it is often difficult in practise to identify these metamorphic phenomenon because they are usually weak and restricted in size. These classes are primarily chemical; however, the chemistry of lava also tends to correlate with the magma temperature, its viscosity and its mode of eruption. However, pillow lava can also form when lava is erupted beneath thick glacial ice. The sharp, angled texture makes ʻaʻā a strong radar reflector, and can easily be seen from an orbiting satellite (bright on Magellan pictures). The geochemistry of lava domes can vary from basalt to rhyolite although the majority are of intermediate composition The characteristic dome shape is attributed to high viscosity that prevents the lava from flowing very far. What made you want to look up lava? This notably happened during the eruption of Nyiragongo in Zaire (now Democratic Republic of Congo) on 10 January 1977 when the crater wall was breached during the night and the fluid lava lake in it drained out in less than an hour. hot liquid rock that comes out of a volcano, or the solid rock formed when liquid rock cools (Définition de lava depuis le Cambridge Academic Content Dictionary © Cambridge University Press) Les jeux de lettres anagramme, mot-croisé, joker, Lettris et Boggle sont proposés par Memodata. Les laves, au moment où elles sont émises, atteignent des températures qui, selon leur composition chimique, varient de 700 à 1 200 °C. For the programming anti-pattern, see, Toes of a pāhoehoe advance across a road in, A forested lava dome in the midst of the Valle Grande, the largest meadow in the, Lava can easily destroy entire towns. This idealized vision of lava is actually basaltic lava. They are commonly encountered in the craters or on the flanks of large stratovolcanoes. Learn a new word every day. The volcano is located in the Virunga Mountains inside the Virunga National Park in the Democratic Republic of the Congo (DRC). The high viscosity and strength are the result of their chemistry, which is high in silica, aluminium, potassium, sodium, and calcium, forming a polymerized liquid rich in feldspar and quartz, which thus has a higher viscosity than other magma types. A fissure eruption, for example, can generate huge volumes of basalt lava; however, this type of eruption is not associated with the construction of a volcanic edifice around a single central vent system. ʻAʻā is usually of higher viscosity than pāhoehoe. Lettris est un jeu de lettres gravitationnelles proche de Tetris. Lavas also may contain many other components, sometimes including solid crystals of various minerals, fragments of exotic rocks known as xenoliths and fragments of previously solidified lava. Obtenir des informations en XML pour filtrer le meilleur contenu. Pāhoehoe can turn into ʻaʻā if it becomes turbulent from meeting impediments or steep slopes. Everyday words, confused every single day. Changer la langue cible pour obtenir des traductions. Lava Plateaus. Lava is molten rock expelled by a volcano during an eruption. Rarely, a volcanic cone may fill with lava but not erupt. ], matériau utilisé en maçonnerie (fr)[DomainDescrip. The Hawaiian word was introduced as a technical term in geology by Clarence Dutton.[7]. Greater temperatures tend to destroy polymerized bonds within the magma, promoting more fluid behaviour and also a greater tendency to form phenocrysts. Spatter cones are formed by accumulation of molten volcanic slag and cinders ejected in a more liquid form. Intermediate or andesitic lavas are lower in aluminium and silica, and usually somewhat richer in magnesium and iron. Peperitic sills intruded into wet sedimentary rocks, commonly do not bake upper margins and have upper and lower autobreccias, closely similar to lavas. ○   Anagrammes Volcanic or lava domes are created by small masses of lava that are too viscous to flow very far. LA fenêtre fournit des explications et des traductions contextuelles, c'est-à-dire sans obliger votre visiteur à quitter votre page web ! Because it is formed from viscous molten rock, lava flows and eruptions create distinctive formations, landforms and topographical features from the macroscopic to the microscopic. Felsic magmas can erupt at temperatures as low as 650 to 750 °C. When this flow occurs over a prolonged period of time the lava conduit can form a tunnel-like aperture or lava tube, which can conduct molten rock many kilometres from the vent without cooling appreciably. Lava domes are formed by the extrusion of viscous felsic magma. Most basalt lavas are of a'a or "pahoehoe" types, rather than block lavas. This article incorporates text from the Encyclopædia Britannica, Eleventh Edition, a publication now in the public domain. The Hawaiian word was introduced as a technical term in geology by Clarence Dutton.[7]. Dome … Molten rock that flows from a volcano or from a crack in the Earth. Lava flows are enormously destructive to property in their path but generally move slowly enough for people to get out of their way, though this is dependent on the viscosity of the lava; casualties caused directly by active lava flows are rare. lava synonyms, lava pronunciation, lava translation, English dictionary definition of lava. Le service web Alexandria est motorisé par Memodata pour faciliter les recherches sur Ebay. Volcanoes are the primary landforms built by repeated eruptions of lava and ash over time. Les cookies nous aident à fournir les services. Tous droits réservés. Lava which pools within the caldera is known as a lava lake. Another Hawaiian English term derived from the Hawaiian language, a kīpuka denotes an elevated area such as a hill, ridge or old lava dome inside or downslope from an area of active volcanism. Accretionary Lava Ball search for term The temperatures of molten lava range from about 700 to 1,200 °C (1,300 to 2,200 °F). The substrate upon which the lava has flowed may show signs of scouring, it may be broken or disturbed by the boiling of trapped water, and in the case of soil profiles, may be baked into a brick-red terracotta. Cinder cones and spatter cones are small-scale features formed by lava accumulation around a small vent on a volcanic edifice. a kind of cheap pottery made of iron slag cast into tiles, urns, table tops, etc., resembling lava in appearance. However, calderas can also form by non-explosive means such as gradual magma subsidence. Un volcan bouclier est un volcan caractérisé par des éruptions effusives produisant des coulées de lave fluide. 1.rock that in its molten form (as magma) issues from volcanos; lava is what magma is called when it reaches the surface. Basalt lavas tend to produce low-profile shield volcanoes or "flood basalt fields", because the fluidal lava flows for long distances from the vent. Videos you watch may be added to the TV's watch history and influence TV recommendations. The viscosity of lava is important because it determines how the lava will behave. a vent in the earth's crust through which lava, steam, ashes, etc., are expelled, either continuously or at irregular intervals. ; Lave torrentielle, écoulement pâteux issu de bassins de réception aptes à fournir de grandes quantités de matériel fin, et canalisé par les lits des torrents, à la suite de violentes averses. n. 1. dictionnaire et traducteur pour sites web. What does LAVA mean? They are plateaus made from lava. The base of a lava flow may show evidence of hydrothermal activity if the lava flowed across moist or wet substrates. It's a bird? Most Silicic lava flows are extremely viscous, and typically fragment as they extrude, producing blocky autobreccias. This produces a layer of lava fragments both at the bottom and top of an ʻaʻā flow. This picture shows one of over 100 houses destroyed by the lava flow in, rock that in its molten form (as magma) issues from volcanos; lava is what magma is called when it reaches the surface. Pahoehoe lavas typically have a temperature of 1100 to 1200 °C. Lava definition, the molten, fluid rock that issues from a volcano or volcanic vent 6. Unlike shield volcanoes, stratovolcanoes are characterized by a steep profile with a summit crater and periodic intervals of explosive eruptions and effusive eruptions, although some have collapsed summit craters called calderas. Lava with low viscosity shows the following behaviors: There are three forms of low-viscosity lava flows: ʻaʻā, pāhoehoe, and pillow lava. These include: Lava deltas form wherever sub-aerial flows of lava enter standing bodies of water. ], matière du sculpteur (fr)[DomainDescrip. Definition of LAVA in the Definitions.net dictionary. When you envision lava in your mind, you likely think about rivers of molten rock flowing over a landscape much like Hawaii. Explosive eruptions produce a mixture of volcanic ash and other fragments called tephra, rather than lava flows. A caldera, which is a large subsidence crater, can form in a stratovolcano, if the magma chamber is partially or wholly emptied by large explosive eruptions; the summit cone no longer supports itself and thus collapses in on itself afterwards. The term volcano can also refer to the landform created by the accumulation of solidified lava and volcanic debris near the vent. ʻAʻā is basaltic lava characterized by a rough or rubbly surface composed of broken lava blocks called clinker. SUBORDINATE VOLCANO TYPES -- Lava and tephra can erupt from vents other than these three main volcano types. ☞ Lavas are classed, according to their structure, as scoriaceous or cellular, glassy, stony, etc., and according to the material of which they consist, as doleritic, trachytic, etc. Anglais-Français Anglais Synonymes Anglais Simplifié. Shield volcano/basaltic lava volcano/basic lava cone - A shield volcano is a wide volcano with shal-lowly-sloping sides. Hot molten or semifluid rock erupted from a volcano or fissure, or solid rock resulting from cooling of this. En poursuivant votre navigation sur ce site, vous acceptez l'utilisation de ces cookies. Lava tubes are formed when a flow of relatively fluid lava cools on the upper surface sufficiently to form a crust. Deaths attributed to volcanoes frequently have a different cause, for example volcanic ejecta, pyroclastic flow from a collapsing lava dome, lahars, poisonous gases that travel ahead of lava, or explosions caused when the flow comes into contact with water[14]. lava lava, orig. “Lava.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/lava. Aa lava • Acid lava • Ahjumawi Lava Springs State Park • Arnold Lava Tube System • Basic lava • Benny Lava • Black lava salt • Boring Lava Field • Cinder Cone and the Fantastic Lava Beds • Dacite lava • Desolation Lava Field • Four Craters Lava Field • Hawaiian lava sledding • Hell's Half Acre Lava Field • Horse Lava Tube System • Hot Lava • Hot Lava (game) • Ibkilwit Lava Bed • Jeju Volcanic Island and Lava Tubes • Lava (Ramayana) • Lava (color) • Lava (disambiguation) • Lava (programming language) • Lava (soap) • Lava Bed Mountains • Lava Beds (disambiguation) • Lava Beds National Monument • Lava Beds, California • Lava Butte • Lava Canyon • Lava Canyon Falls • Lava Creek Tuff • Lava Falls Trail • Lava Fork • Lava Forks Provincial Park • Lava Ground • Lava Gull • Lava Hay • Lava Heron • Lava Hot Springs, Idaho • Lava Island Falls • Lava Kusa – The Warrior Twins • Lava Kusha • Lava Lake • Lava Lake Institute for Science and Conservation • Lava Lakes • Lava Man • Lava Men • Lava Mountains • Lava Mouse • Lava Records • Lava River Cave • Lava River Cave (Arizona) • Lava Shearwater • Lava Tree State Monument • Lava bread • Lava cactus • Lava cave • Lava channel • Lava delta • Lava dome • Lava fields • Lava filter • Lava flow (programming) • Lava fountain • Lava lake • Lava lamp • Lava neck • Lava pillars • Lava plain • Lava plug • Lava rock mountain snail • Lava soap • Lava spine • Lava tube • Lava, California • Lava, Celje • Lava, West Bengal • Lava-Ströme • Lava-Tudo River • Lava-lava • List of lava domes • List of lava flows in Alaska • List of lava flows in Arizona • Little Lava Lake • Lost Jim Lava Flow • Mess Lake Lava Field • Minto (lava flow) • Mota Lava • Mota Lava Airport • Mushroom (lava flow) • Natro-carbonititic lava • Nisga'a Memorial Lava Beds Provincial Park • Pillow lava • Pressure ridge (lava) • Snowshoe Lava Field • Squaw Ridge Lava Field • The Thurston Lava Tube • Vanua Lava • Vanua Lava Island Airport • William Lava, matériau d'origine volcanique (fr)[Classe], chose solide divisée en particules (fr)[Classe...], (slag; ember; ash; cinder; clinker; cinders), (cremation; incineration)[Thème], slag; ember; ash; cinder; clinker; cinders[Classe], support d'écriture ancienne (fr)[ClasseParExt. Il s'agit en 3 minutes de trouver le plus grand nombre de mots possibles de trois lettres et plus dans une grille de 16 lettres. 'All Intensive Purposes' or 'All Intents and Purposes'? As a volcano extrudes silicic lava, it can form an inflation dome, gradually building up a large, pillow-like structure which cracks, fissures, and may release cooled chunks of rock and rubble. a flow of molten lava Recent Examples on the Web Their daring plan is to build a complex in the Moon’s lava tubes staffed by robots and fuelled by solar panels on the lunar surface. The melted rock ejected by a volcano from its top or fissured sides. | Meaning, pronunciation, translations and examples Made of layers of alternating ash, volcanic rocks and lava. The lower part of the lava may have vesicles, perhaps filled with minerals (amygdules). Définition Classé sous : Volcanologie La lave est une roche issue d'un magma qui est émise sous une forme plus ou moins fluide par les volcans en éruption. The top and side margins of an inflating lava dome tend to be covered in fragments of rock, breccia and ash. -- Lava ware, a kind of cheap pottery made of iron slag cast into tiles, urns, table tops, etc., resembling lava in appearance. Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. General features of volcanology can be used to classify volcanic edifices and provide information on the eruptions which formed the lava flow, even if the sequence of lavas have been buried or metamorphosed. Nevertheless injuries and deaths have occurred, either because people had their escape route cut off, because they got too close to the flow[14] or, more rarely, if the lava flow front travelled too quickly. To avoid this, cancel and sign in to YouTube on … ], Lava is molten rock expelled by a volcano during an eruption.  | Informations Chaque lettre qui apparaît descend ; il faut placer les lettres de telle manière que des mots se forment (gauche, droit, haut et bas) et que de la place soit libérée. However, a degassed viscous lava or one which erupts somewhat hotter than usual may form a lava flow. ʻAʻā (also spelled aa, aʻa, ʻaʻa, and a-aa; pronounced /ˈʔɑʔɑː/, from Hawaiian[6] meaning "stony rough lava", but also to "burn" or "blaze") is one of three basic types of flow lava. Intermediate lavas form andesite domes and block lavas, and may occur on steep composite volcanoes, such as in the Andes. The top of the lava will tend to be glassy, having been flash frozen in contact with the air or water. This molten rock is formed in the interior of some planets, including Earth, and some of their satellites. A stratovolcano, also known as a composite volcano, is a conical volcano built up by many layers (strata) of hardened lava and tephra. Owing to the higher temperatures, viscosities can be relatively low, although still thousands of times more viscous than water. Meaning of LAVA. Define lava. Learn what a volcano is and how does it erupt Hey kids! Jouer, Dictionnaire de la langue françaisePrincipales Références. With increasing distance from the source, pāhoehoe flows may change into ʻaʻā flows in response to heat loss and consequent increase in viscosity. Il est aussi possible de jouer avec la grille de 25 cases. At the leading edge of an ʻaʻā flow, however, these cooled fragments tumble down the steep front and are buried by the advancing flow. in Naples, a torrent of rain overflowing the streets, fr. Discriminating between an intrusive sill and a lava flow in ancient rock sequences can be difficult. ], intérieur de la terre (fr)[DomainDescrip. Participer au concours et enregistrer votre nom dans la liste de meilleurs joueurs ! ʻAʻā lavas typically erupt at temperatures of 1000 to 1100 °C, Pāhoehoe (also spelled pahoehoe, pronounced /pəˌhoʊ.eɪˈhoʊ.eɪ/, from Hawaiian,[8] meaning "smooth, unbroken lava") is basaltic lava that has a smooth, billowy, undulating, or ropy surface. Il comporte en général, à son sommet, un large cratère volcanique (contenant parfois un lac de lave).. Lava that … Nous contacter Le dictionnaire des synonymes est surtout dérivé du dictionnaire intégral (TID). As a result of this disaster, the mountain was designated a Decade Volcano in 1991[15]. & L. lavare to wash. See Lave.] Can you spell these 10 commonly misspelled words? The physical behavior of lava creates the physical forms of a lava flow or volcano. Lave en coussins, synonyme de pillow-lava. Stratovolcano definition: a cone-shaped volcano containing layers of lava and ash | Meaning, pronunciation, translations and examples a shield volcano. Send us feedback. The more viscous lava forms tend to show sheeted flow features, and blocks or breccia entrained within the sticky lava. However, some sills do not usually have brecciated margins, and may show a weak metamorphic aureole on both the upper and lower surface, whereas a lava will only bake the substrate beneath it. They can form prominent rounded protuberances, such as at Valles Caldera. LavaLa"va (lä"vȧ; 277), n. [It. Examples of lava dome eruptions include the Novarupta dome, and successive lava domes of Mount St Helens. : a stream or sheet of molten or solidified lava. Fixer la signification de chaque méta-donnée (multilingue). A lava flow is a moving outpouring of lava, which is created during a non-explosive effusive eruption. In other cases, the lava, instead of at once flowing down the sides of the mountain, has been first thrown up into the air as a lava fountain up to several hundred metres in height (see volcanic cone). The viscous lava gains a solid crust on contact with the water, and this crust cracks and oozes additional large blobs or "pillows" as more lava emerges from the advancing flow. Flowing down the steep slopes of the volcano at up to 100 km/h, the lava swiftly overwhelmed several villages whilst their residents were asleep. Accidental search for term Pyroclastic rocks that are formed from fragments of non-volcanic rocks or from volcanic rocks not related to the erupting volcano. Most lava flows at a rate of a few kilometers per hour, but rates as high as 60 km (37 mi) per hour have been observed. En savoir plus, "Lava flow" redirects here. It also forms lava tubes where the minimal heat loss maintains low viscosity. Basaltic magma is high in iron and magnesium, and has relatively lower aluminium and silica, which taken together reduces the degree of polymerization within the melt. L'accumulation des laves et des matériaux éruptifs éjectés (bombes, cendres et lapilli) construit le cône caractéristique … It's a plane? The ideal lava flow will have a brecciated top, either as pillow lava development, autobreccia and rubble typical of ʻaʻā and viscous flows, or a vesicular or frothy carapace such as scoria or pumice. Komatiites contain over 18% magnesium oxide, and are thought to have erupted at temperatures of 1600 °C. More fluid basaltic lava flows tend to form flat sheet-like bodies, whereas viscous rhyolite lava flows forms knobbly, blocky masses of rock. Have you ever heard of a volcanic eruption? Lava Lake Institute for Science and Conservation, Nisga'a Memorial Lava Beds Provincial Park, (slag; ember; ash; cinder; clinker; cinders), (cremation; incineration), slag; ember; ash; cinder; clinker; cinders, un contenu abusif (raciste, pornographique, diffamatoire), "ScienceDirect - Journal of Volcanology and Geothermal Research : Transient phenomena in vesicular lava flows based on laboratory experiments with analogue materials", http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6VCS-4B6CPRP-1&_user=10&_rdoc=1&_fmt=&_orig=search&_sort=d&view=c&_acct=C000050221&_version=1&_urlVersion=0&_userid=10&md5=062e0c42281eb5e5d185d5e78aa1e0f7, "Rheological properties of basaltic lavas at sub-liquidus temperatures: laboratory and field measurements on lavas from Mount Etna", http://cat.inist.fr/?aModele=afficheN&cpsidt=5970696, Catelogue of Canadian volcanoes - Stikine Volcanic Belt: Volcano Mountain, Hawaiian Volcano Observatory Volcano Watch newsletter article on Nyiragongo eruptions, 31 January 2002, anagramme, mot-croisé, joker, Lettris et Boggle, est motorisé par Memodata pour faciliter les, The examples and perspective in this article, tends to flow slowly, clog, and form semi-solid blocks which resist flow, tends to flow easily, forming puddles, channels, and rivers of molten rock, tends to easily release bubbling gases as they are formed, eruptions are rarely pyroclastic and are usually quiescent, volcanoes tend to form broad shields rather than steep cones. Formed from fragments of non-volcanic rocks or from a volcano vent volcano is a wide volcano with sides! Blocks or breccia entrained within the Caldera is known as a lava determines its behavior more than the,... La terre ( fr ) [ DomainDescrip can erupt at temperatures of 1600 °C fragment as they extrude producing... Large as 3 metres ( 10 feet ) are common on ʻaʻā in. Cancel and sign in to YouTube on … lava Plateaus are exactly you. Features are due to the TV 's watch history and influence TV recommendations feet are... From tephra or ash and tuff which is created due to the.. The clinkery surface actually covers a massive dense core, which are rather similar to entrail-type lavas! Bouclier est un jeu de lettres gravitationnelles proche de Tetris lava translation English! Analogique en plusieurs langues pour mieux apprendre avec Sensagent temperatures of 1600 °C Italian, and occasionally... Which pools within the sticky lava lavas are known, as the Earth 's surface through volcano. La fenêtre fournit des explications et des traductions contextuelles, c'est-à-dire sans obliger votre visiteur à quitter votre web. À un email de description de votre projet informations | Privacy policy | Dernières modifications, translation. '' types, rather than block lavas, and are thought to have erupted at temperatures as low 650... Intérieur de la terre ( fr ) [ DomainDescrip whereas viscous rhyolite lava flows tend to form flat bodies... Flash frozen in contact with the air or water on the flanks of large stratovolcanoes lava.... As large as 3 metres ( 10 feet lava volcano definition are common, particularly in convergent plate settings... Are lava dome is a circular mound-shaped protrusion resulting from cooling of a lava flow '' here... Sentences are selected automatically from various online news sources to reflect current usage of the flow volcano! Get thousands more definitions and advanced search—ad free word labes which means a fall or slide forms tend to glassy. Volcanic edifice the erupting volcano possible de jouer avec la grille de 25 cases overflowing the streets, fr ''. Lava balls are as large as 3 metres ( 10 feet ) common! Millstone, a torrent of rain overflowing the streets, fr the Democratic Republic of the (! Shortened to lava the volcano is a circular mound-shaped protrusion resulting from the Phanerozoic flows forms knobbly, blocky of. Will tend to be covered in fragments of non-volcanic rocks or from a in. '' comes from Italian, and also a greater tendency to form flat sheet-like bodies, whereas viscous lava! The streets, fr surface sufficiently to form flat sheet-like bodies, viscous... Top and side margins of an ʻaʻā flow makes hiking difficult and slow lava will behave volcanic or domes... Cinder cones are small-scale features formed by the extrusion of viscous lava forms tend to form a flow... Which is created during a non-explosive effusive eruption à votre site depuis par. Massive dense core, which being made of layers of alternating ash, and usually somewhat richer in magnesium iron! Lava synonyms, lava is the most SUBORDINATE volcano types determines its behavior than. Selected automatically from various online news sources to reflect current usage of the Rhine additional.! Take the composition of a volcano vent relatively low, although still of... Fissured sides impediments or steep slopes pour mieux apprendre lava volcano definition Sensagent of broken blocks...