which magma type would generally have the lowest viscosity?

. Free. Which Type Of Magma Is Known For The Most Violent ... Q08 Q08 Q08 . Volcanoes, Magma, and Volcanic Eruptions Eruptions associated with basaltic lava usually are not explosive due to the low silica and gas content. Questions to Answer: 1. High silica melts can be many orders of magnitude more viscous than basalts. The magma that has the highest viscosity is rhyolitic magma. answer choices . What type of magma has the lowest viscosity? - Answers Viscosity is the resistance to flow (opposite of fluidity). in Fe, Mg, Ca, Na, K. Rhyolitic magma — SiO2 65-75%, low in Fe, Mg, Ca, high in K, Na. Magmas have a viscosity which is their resistance to flow. Everyday examples are water (low viscosity) and hot tar (high viscosity). Is the inverse of fluidity. High viscosity magmas clog the piping system. Three general types are recognized: Basaltic magma -- SiO 2 45-55 wt%, high in Fe, Mg, Ca, low in K, Na Andesitic magma -- SiO 2 55-65 wt%, intermediate. Unlock to view answer. . Most shields were formed by low viscosity basaltic magma that flows easily down slope away form the summit vent. The is thin and runny. Basaltic magma is low in viscosity compared to felsic magma. Mafic: Mafic magma has a low viscosity, with high temperatures. It has a silica content of 65-75%. Magmas that have a high silica content will therefore exhibit greater degrees of polymerization, and have higher viscosities, than those with low-silica contents. Which one of the following shows the correct order (left to right) of decreasing magma viscosity? As a lava cools, the viscosity increases as the lava starts to solidify. Viscosity is defined as the resistance to flow. Higher SiO 2 (silica) content magmas have higher viscosity than lower SiO 2 content magmas (viscosity increases with increasing SiO 2 concentration in the magma). A high volatile content decreases viscosity (like . Viscosity controls the rate of magma flow in response to a given pressure change and the rate at which gas bubbles and solids (rock fragments and crystals) move through a magma. What is a low-silica magma? - Answers The viscosities of magmas increase with increasing percentages of silica. A) Basaltic B) Granitic C) Andesitic D) Pegmatitic. The lower the silica content, the lower the viscosity. Viscosity is a fluid"s resistance come flow. There are two principal types of lava flows in Hawaii. Felsic Magmas: The rocks that form from this type of magma are representative of continental rocks. It is distributed across divergent plate boundaries, hot spots, convergent plate boundaries. Which magma type would generally have the lowest viscosity? andesitic magmas If the viscosity is low non explosive ... What factors decrease viscosity of magma? _____ magma is the most abundant type of magma erupted on Earth. What are the three main types of magma? CHP 9 E&S sci Flashcards | Quizlet Geological Society - Viscosity of Magmas The below picture is of the mafic rock basalt. Volcanic Eruptions - Volcanoes, Craters & Lava Flows (U.S ... Answer: Felsic magma has the highest silica content of all magma types, between 65-70%. Answer: Felsic magma has the highest silica content of all magma types, between 65-70%. Viscosity depends on primarily on the composition of the magma, and temperature. Which magma type would generally have the lowest viscosity? Volcano Watch — Why are Mount St. Helens' eruptions ... Magma and Lava - Types of Magma and Lava [UPSC Notes] Viscosity rank Low. Which type of magma/lava has the lowest viscosity and least violent eruptions and which has the highest viscosity and the most violent eruptions? in Fe, Mg, Ca, Na, K Rhyolitic magma -- SiO 2 65-75%, low in Fe, Mg, Ca, high in K, Na Gases in Magmas It is said that the higher the silica content, the higher the viscosity. Shield volcanoes thus form by relatively non-explosive eruptions of low viscosity basaltic magma.Vents for most shield volcanoes are central vents, which are circular vents near the summit. Their relatively low viscosities are why basalts are generally extruded in quiet (effusive) or mildly explosive eruptions. Magma has a higher viscosity if it has a lower temperature, is rich in silica, and contains a high abundance of dissolved gases Use the rock cycle to explain the statement "One rock is the raw . Andesitic magma — SiO2 55-65 wt%, intermediate. Kilauea on the Big Island, for example, has erupted mafic lava almost continuously since 1983. They include two types Volcanic or extrusive igneous rocks form when the magma cools and crystallizes on the surface of the Earth ; Intrusive or plutonic igneous rocks wherein the magma crystallizes at depth in the Earth. Unlocked . andesitic. The effect of temperature on viscosity is intuitive. The lower the silica content, the lower the viscosity. Powerful, explosive, volcanic eruptions can result in climatic cooling for millions of years following the eruption. Which magma type has the lowest viscosity? Acidic lava, which is very viscous (sticky). Forms when rocks in the upper mantle melt. Rhyolite, andesite, basalt. List and define each of the three major types of volcanoes and give one example of each. Higher SiO2(silica) content magmas have higher viscosity Since volcanic eruptions are caused by magma (a mixture of liquid rock, crystals, and also dissolved gas) expelled top top the Earth"s surface, we"ll first review the characteristics of magma the we extended previously. Which type of volcanoes is most violent? Magma-the name for lava before it erupts--is strongly influenced by its viscosity. Viscosity of Magmas Viscosity is the resistance to flow (opposite of fluidity). As a result, felsic magma also has the highest gas content and viscosity, and lowest mean temperatures, between 650o and 800o Celsius (1202o and 1472o Fahrenheit). Viscosity depends on primarily on the composition of the magma, and temperature. basalt. Free . The average composition of rocks comprising a large composite cone or stratovolcano is generally _____. Silica, also called silicon dioxide, compound of the two most abundant elements in Earth's crust, silicon and oxygen, SiO2. These magma's have a low viscosity since the lower the SiO2-content, the lower the viscosity; and hence flow easily (↔ . Rather . As a result, felsic magma also has the highest gas content and viscosity, and lowest mean temperatures, between 650o and 800o Celsius (1202o and 1472o Fahrenheit). Magma. Basaltic magma-- SiO2 45-55 wt%, high in Fe, Mg, Ca, low in K, Na 2. The more complex the silicates melted in the magma, the higher the viscosity. What type of volcanic material is indicative of eruption under water? Which is magma type has the highest viscosity? Q09 Q09 Q09 . The amount of silica influences the magma's viscosity in such a way that if the silica content is low, the magma would have low viscosity, whereas a high content of silica would make the magma more thick and sticky. Volatile Content: Magma invariably contains small amounts of dissolved gas (water, CO 2 etc) which is released as pressure is removed. Viscosity depends on primarily on the composition of the magma, and temperature. The higher the viscosity of a magma, the _____ the potential for explosive eruptions. Explosive eruptions generally involve magma that is more viscous and has a higher gas content. The magma-bubble mixture will therefore move as a single fluid. basalt andesite dacite rhyolite 1 points Save Answer QUESTION A magma with a high SiO (silica) content has a higher viscosity than one with a lower SiO content (its viscosity increases as SiO concentration increases). For example: a basaltic magma. Basaltic magma is high in iron, magnesium, and calcium but low in potassium and sodium. Andesitic magma has moderate amounts of these minerals, with a temperature range from about 800 o C to 1000 o C (1472 o F to 1832 o F). The is thick and goopy. Before cooling, mafic lava has a very low viscosity. basalt. Three general types are recognized, but we will look at other types later in the course: 1. . Basalt. However, it does contain a lot of magnesium and iron, along with a low gas content. This type of magma is low in iron, magnesium, and calcium while high in potassium and sodium. A Hawaiian eruption is a type of volcanic eruption where lava flows from the vent in a relatively gentle, low level eruption; it is so named because it is characteristic of Hawaiian volcanoes.Typically they are effusive eruptions, with basaltic magmas of low viscosity, low content of gases, and high temperature at the vent.Very small amounts of volcanic ash are produced. Generally, the magmas are considered into four types: Ultramafic The temperature of the ultramafic magma reaches up to 1500 degree Celcius. A magma's viscosity. Felsic Magma Of all the types of magma that exist, felsic magma has the most silica in it. The amount of dissolved gases in the magma can also affect it's viscosity, but in a more ambiguous way than temperature and silica content. Volatile Content: Magma invariably contains small amounts of dissolved gas (water, CO 2 etc) which is released as pressure is removed. . Igneous Rocks are formed by crystallization from a liquid, or magma. How does viscosity affects the movement of magma? Which components of magma is the highest and the lowest in value? Its chemical composition Answer (1 of 5): * Pelean - These eruptions result from the collapse of an andesitic or rhyolitic lava dome, with or without a directed blast, to produce glowing avalanches or nuée ardentes, as a type of pyroclastic flow known as a block-and-ash flow. basalt. Which one of the following shows the correct order (left to right)of decreasing magma viscosity? Multiple Choice . Mafic rocks are also often distinguished by their dark color. Mafic temperature. Three simple types the magma: Mafic or Basaltic-- SiO2 45-55 wt%, high in Fe, Mg, Ca, short in K, Na intermediate or Andesitic-- SiO2 55-65 wt%, intermediate. Hear this out loudPauseA basaltic lava flow has a low viscosity due to its low SiO2 content. A) Basaltic answer choices . What type of volcanic material is indicative of eruption under water? Most basaltic magma rises relatively rapidly to Earth's surface and reacts very little with crustal rocks because of it's low viscosity. These enormous structures form the largest (in volume and mass) mountains on Earth. You are watching: What type of magma has the highest viscosity. Which magma type would generally have the lowest viscosity? The higher the viscosity of a magma, the lower the potential for explosive . Viscosity is the resistance to flow (opposite of fluidity). Temperature, composition, and volatile (gas) content largely determine the viscosity of lava. Which magma type would generally have the lowest viscosity? When magma reaches the surface of the earth, it is called lava. Basaltic magma - 1000 to 1200oC Andesitic magma - 800 to 1000oC Rhyolitic magma - 650 to 800oC. Why does magma have a higher viscosity than water? Viscosity varies from one lava to another lava and from one magma to another magma. It ranges in temperature from about 1000 o C to 1200 o C (1832 o F to 2192 o F). In general, eruptions can be categorized as either effusive or explosive. Basalt generally has a composition of 45-52 wt% SiO2, 2-5 wt% total alkalis, 0.5-2.0 wt% TiO2, 5-14 wt% FeO and 14 wt% or more Al2O3. Which type of magma flows the fastest? True. What type of lava does Hawaii have? granite. The viscosity of magma highly depends on the composition of the magma. Gases (mostly steam) build up in the magma chamber and explode VI. MAGMA VISCOSITY, TEMPERATURE, AND GAS CONTENT. Steep sides as the lava doesn't flow very far before it solidifies. Since volcanic eruptions are caused by magma (a mixture of liquid rock, crystals, and dissolved gas) expelled onto the Earth's surface, we'll first review the characteristics of magma that we covered previously.. Three basic types of magma: Mafic or Basaltic-- SiO 2 45-55 wt%, high in Fe, Mg, Ca, low in K, Na They tend to have high Silicon content, also known as Silica content. Lower temperature magmas have higher viscosity than higher temperature magmas (viscosity decreases with increasing temperature of the magma). They may also produce surges with resulting . Thus, basaltic magmas tend to be fairly fluid (low viscosity), but their viscosity is still 10,000 to 100,0000 times more viscous than water. Non explosive eruptions are favored by low gas content and low viscosity magmas (basaltic to andesitic magmas). Andesitic magma-- SiO2 55-65 wt%, intermediate. A magma containing not much silica (= SiO2). density, specific heat, viscosity, and thermal conductivity of typical rhyolitic magma bearing 2 wt% dissolved H 2O at 900 C at low pressure, are 2260 kg/m3, 1450 J/kg K, 500,000 Pa s, and 1 W/m K, respectively. Which magma type would generally have the lowest viscosity? Higher SiO 2 (silica) content magmas have higher viscosity than lower SiO 2 content magmas (viscosity increases with increasing SiO 2 concentration in the magma). Viscosity is defined as the ability of a substance to resist flow. Explosive Eruptions Explosive eruptions are favored by high gas content and high viscosity (andesitic to rhyolitic magmas). Heating reduces viscosity (warm syrup flows more easily than cold.) Powerful, explosive, volcanic eruptions can result in climatic cooling for millions of years following the eruption. Lava Type: Rhyolite. If the viscosity is low, non-explosive eruptions usually begin with fire fountains due to release of dissolved gases. A liquid is said to have a high viscosity if it flows slowly and a low viscosity if it flows freely. However, basaltic eruptions display great variability, from mild lava flows to more energetic explosions with large plumes. In a sense, viscosity is the inverse of fluidity.Cold molasses, for example, has a higher viscosity than water because it is less fluid. Free. CONTROLS OF VISCOSITY OF MAGMA A. ; Magma is a mixture of liquid rock, crystals, and gas. Deals with the viscosity of the magma Viscosity--the measure of how easily a fluid flows High viscosity = pasty (e.g., molasses) Low viscosity = watery (e.g., water) B. . Basaltic magma has the lowest viscosity, so more of it reaches the surface; the more viscous rhyolitic magmas are so sluggish that they tend to be trapped deep below the surface where they cool, solidify, and grow into the larger mineral crystals of plutonic rocks. Which component of magma is the highest and lowest in value? The viscosity of magma highly depends on the composition of the magma. Made up of only 50% silica, the silica content of mafic magma is considered very low. Basaltic magma has a low viscosity whereas rhyolitic magma has a high viscosity. A high volatile content decreases viscosity (like . Types of magma are determined by chemical composition of the magma. A water-free rhyolitic melt of otherwise identical composition has a density and viscosity of 2350 kg/m3 and 1.2 1010 Pa s . In contrast, rhyolite magmas are viscous enough to limit bubble movement. Calderas are generally large (some up to 15 miles in diameter), steep-walled, basin-shaped depressions formed by the collapse of a volcanic edifice into an emptying magma chamber and although the word caldera only refers to the vent, many use calderas as a volcano type, typically formed by high-viscosity felsic volcanism with high volatile content. Temperature and magma composition are the most important factors that influence viscosity. Magmas and Lava . Magmas that have a high silica content will therefore exhibit greater degrees of polymerization, and have higher viscosities, than those with low-silica contents. 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. QUESTION 1 Which magma type would generally have the lowest viscosity? Answer: Felsic magma has the highest silica content of all magma types, between 65-70%. View Test Prep - ch 9 quiz from EARTH 106 at MiraCosta College. How explosive is basaltic? A stratovolcano, also known as a composite volcano, is a conical volcano built up by many layers (strata) of hardened lava and tephra. pumice. But the more technical and accurate answer would be . As a result, felsic magma also has the highest gas content and viscosity, and lowest mean temperatures, between 650o and 800o Celsius (1202o and 1472o Fahrenheit). 1.High silica, high temperature 2.High silica . Felsic magma has the highest silica content of all magma types, between 65-70%. The mass of Earth's crust is 59 percent silica, the main constituent of more than 95 percent of the known rocks. Unlike the case of low-viscosity magma, when bubbles coalesce, they form a permeable network, and the magma can develop a foamy structure. Has a higher viscosity than water because it is less fluid. Such a granitic magma if extruded onto the earth surface, will be called rhyolitic magma with silica content of approximately 65 - 75%. Lava erupting . Rhyolitic Magma. . . It tends to be more fluid (lower viscosity), hence flows more quickly and produces thinner flows (typically 1-3 m). Which magma type would generally have the lowest viscosity? Becomes, thus lowering its viscosity. pillow lavas. The surface of volcanic domes are generally very rough, with numerous spines that have been pushed up by the magma from below. The viscosities of magmas increase with increasing percentages of silica. Basaltic . Which magma type would generally have the lowest viscosity? Characteristics of Magma Types of Magma Types of magma are determined by chemical composition of the magma. Hawaiian shield volcanoes also have flank vents, which radiate from the summit and take the form of en-echelon fractures or fissures, called rift zones . It is said that the higher the silica content, the higher the viscosity. 3. A. …. Shield volcanoes thus form by relatively non-explosive eruptions of low viscosity basaltic magma. What is the main factor that determines how volcanoes erupt? Magmas formed by melting of mantle rocks have generally low volatile contents, but those formed by partial melting of crustal rocks are often volatile-rich. A)basalt B)andesite C)dacite D)rhyolite Silica Content (% Weight) 53-68 Magma temperature 800-1100 C Viscosity rank Intermediate. Mafic magmas typically have 1% to 3% volatiles. The viscosity and silica content of a magma determines how it erupts. PAHOEHOE - has a shiny, smooth, glassy surface. Of chemical bonds within the liquid. answer choices . True. has the same composition as basalt and fuels the volcanoes that make up Hawaii. in Fe, Mg, Ca, Na, K 3. Why is basaltic lava less explosive? Generally magma has a temperature range from 700-1300 degrees Celsius. Felsic magma has the highest silica content of all magma types, between 65-70%. Silica Content (% Weight) More than 68 Magma temperature 700-850 C Viscosity rank High. Bubbles in high-viscosity magmas have low mobility and remain coupled to the magma at all times. Among the three, basalt has the lowest silica content and that would mean that its' viscosity is the lowest among the given. Which type magma most likely has the lowest viscosity? High viscosity lavas flow slowly and typically cover small areas. _____ magma is the most abundant type of magma erupted on Earth. Felsic magmas are the 'coolest' of all magma types, normally ranging from about 650 to 800 degrees C (roughly 1200 to 1500 F) and also have the highest silica content, coming in at anywhere between 65 and 75 percent. Viscosity depends on primarily on the composition of the magma, and temperature. Viscosity is the resistance to flow in a liquid. How does lava and magma differ in viscosity? The viscosity of a substance is a measure of its consistency. Shield volcanoes are composed almost entirely of relatively thin lava flows built up over a central vent. Composite volcano magma is felsic, which means it contains silicate-rich minerals rhyolite, andesite, and dacite. 2. As a result of its higher viscosity and gas content, intermediate magma builds up pressure below the Earth's surface before it can be released as lava. . Calderas. . Low viscosity and low gas content generally lead to quiescent eruptions. What factors influence magma lava viscosity? As the ability of a substance to resist flow. The percentage of silica in felsic magma is between 65% and 70%, and, because of this, it also has the highest viscosity (gooiness) and gas content. Low viscosity magmas, such as some basalts, can form very long lava flows very rapidly. Magmas and Lava. Answer (1 of 6): Well the more general answer will be a felsic magma of granodioritic-granitic composition. Volatiles in a magma with a low viscosity, generally mafic with a lower silica content, tend to vent and can give rise to a lava fountain. Low-viscosity lava from a shield volcano, such as might be found in Hawaii, flows from fissures and spreads. Viscosity of Magmas Viscosity is the resistance to flow (opposite of fluidity). In general the viscosity of a low silica magma like basalt is thousands of times more viscous than liquid water. Why do magmas have different viscosities? A) basalt B) andesite C) dacite D) rhyolite. Magma and Igneous Rocks. Magmas formed by melting of mantle rocks have generally low volatile contents, but those formed by partial melting of crustal rocks are often volatile-rich. Lava Type: Andesite. Composite volcanoes have the following characteristics: Andesitic magma, which is lower in temperature, has more silica and a lot of dissolved gases and is more likely to explode when it reaches the surface. Rhyolitic magma is a jelly-like type of magma that is made up of basaltic magma and siliceous materials. The type of magma erupted on the Hawaiian Islands is predominantly basaltic. Effusive eruptions involve the outpouring of basaltic magma that is relatively low in viscosity and in gas content. A) basalt. As a result, felsic magma also has the highest gas content and viscosity, and lowest mean temperatures, between 650o and 800o Celsius (1202o and 1472o Fahrenheit). Higher SiO 2 (silica) content magmas have higher viscosity than lower SiO 2 content magmas (viscosity increases with increasing SiO 2 concentration in the magma). Volatiles in a magma with a high viscosity, generally felsic with a higher silica (SiO2) content, tend to produce eruptions that are explosive. Viscosity is the measure of the resistance to flow by a fluid. Unlocked . Is silica the most abundant element on earth? H ear this out loudPauseBasaltic magmas have lower viscosities, higher temperatures, and lower volatile contents than silicic magmas, and therefore generally have a lower potential for explosive activity. Types of Magmas. Because the viscosity is low, mafic magma tends to produce volcanic cones with gentle slopes, called shield volcanoes. Example: Pine Sap or Molasses (High Viscosity) vs. Water (Low Viscosity) The HIGHER the viscosity, the more resistance to flow!! It has a very low viscosity (Which leads to gentler and less explosive eruptions). 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