Volcanic rocks are eruptive rocks and are part of igneous rocks, as well as plutonic plutonic rocks crystallized at depth (such as granite granite). The accumulation of lava flows and other eruptive eruptive materials (bombs, ash and lapillilla) forms the conenenecon characteristic of volcanoes, the shape of which depends on the viscosity viscosity of the lava and / or its gas content. Lava is a molten rock produced by a volcano during an eruption. It comes from the depths of the subsoil. Its temperature is between 700 and 1200 °C. When it solidifies in contact with air or water, it becomes a volcanic rock. It helps to form the characteristic cone of a volcano. Lava (imperative Lav, infinitive to Lava, present Laver, past Lavede, perfect form har lavet) In the video: the spectacular eruptions of Kilauea and its lava lake Fantastic journey to the edge of the lava lake of Nyiragongo Lava is a rock made of magmatic magma that is emitted in a more or less fluid form by erupting volcanic volcanoes. These rocks are rich in silica (bedrock).
Their temperature varies from 700 to 1200 ° C with possible emissions of gases such as sulfur dioxide or carbon). Their composition and appearance vary depending on the type of magma formation. Related to Old High German leiba (“Lava”), Old Norse leif (“Lava”), Old English belīfan (“stay”). More at belive. The lava of the Nyiragongo could come from the depths of the Earth`s mantle middle Scots lave, laif, lafe (“rest, rest, what remains”), from the Old English lāf (“lava, rest, rest”). Similar to Old High German leiba (“lava”), Old Norse leif (“lava”), Old English belīfan (“stay”). No more on vacation. Redirecting a lava flow is extremely difficult, but it can be achieved under certain circumstances, as has already been partially achieved in Vestmannaeyjar, Iceland. [85] The optimal design of simple, inexpensive barriers that divert lava flows is an area of ongoing research. [86] [87] Eruption: Mayon Volcano in the Philippines spits out Lava fountains Ital. according to Diez, from the Neapolitan lava, which means shower, and which comes from the verb lavare, to wash, the shower of water having been transported to the shower of flaming matter. From Middle English washes (“wash; pour; Stream; Lease or draw water, drain, exhaust”), from the Old English lafian, ġelafian (“to pour; refresh”), from West Proto-Germanic *labōn (“refresh; resuscitate; “), of uncertain origin.
Influenced by the old French Laver and the Latin lavō (“wash, bathe”)[1] Sometimes compared to the ancient Greek λωφάω (lōpháō, “to recover, to rest”), also of unknown origin. [2] Lava can be more or less fluid, depending on its chemical composition: The word lava comes from Italian and is probably derived from the Latin word labes, which means a fall or a slide. [2] [3] An early use of the word in relation to the extrusion of magma below the surface can be found in a brief account of the eruption of Vesuvius in 1737, written by Francesco Serao, who described “a river of fiery lava” as an analogy to the flow of water and mud along the flanks of the volcano (a lahar) after heavy rains. [4] [5] Made of old Swedish leaf, perhaps lodge root (“barn type”). Areas of recent lava flows remain a danger long after the lava has cooled. Where young currents have created new lands, the land is more unstable and can break away into the sea. Currents often tear deeply and form dangerous abysses, and a fall against `aʻā lava is similar to a fall against broken glass. Sturdy hiking boots, long pants and gloves are recommended when crossing lava flows.
Pillow lava is the lava structure usually formed when lava emerges from an underwater volcanic vent or subglacial volcano, or a lava flow enters the ocean. Viscous lava gains a solid crust on contact with water, and this crust tears and seeps in large spots or extra “pillows” as more lava emerges from the advancing river. Since water covers most of the earth`s surface and most volcanoes are near or below water bodies, pillow lava is very common. [64] ʻAʻā (also spelled aa, aʻa, ʻaʻa and a-aa, pronounced [ʔəˈʔaː] or /ˈɑː(ʔ)ɑː/) is one of the three basic types of river lava. ʻAʻā is basaltic lava characterized by a rough or rubbery surface consisting of fractured lava blocks called clinker. The word is Hawaiian and means “stony rough lava”, but also “burn” or “flame”; [52] it was introduced by Clarence Dutton as a technical term in geology. [53] [54] Small extra sink, especially in the toilet. A caldera, a large subsidence crater, can form in a stratovolcano when the magma chamber is partially or completely emptied by large explosive eruptions; The summit cone no longer supports itself and therefore collapses afterwards. [66] These features may include volcanic crater lakes and lava domes after the event. [67] However, calderas can also form through non-explosive agents such as the gradual subsidence of magma. This is typical of many shield volcanoes.
[68]. Because it is formed from viscous molten rocks, lava flows and eruptions create distinctive formations, reliefs, and topographical features ranging from macroscopic to microscopic. There are few places in the world where there are permanent lava lakes. These include: Lava of unusual composition has erupted on the surface of the Earth. Examples of lava dome eruptions include the Novaupta Dome and the successive lava domes of Mount St. Helens. [72] A Pāhoehoe river usually presents itself as a series of small lobes and toes that constantly gush out of a cooled crust. It also forms lava tubes, in which minimal heat loss maintains low viscosity. The surface structure of Pāhoehoe streams varies greatly and shows all sorts of bizarre shapes, often called lava sculptures.