The viscosities of magmas increase with increasing percentages of silica. Viscosity depends on primarily on the composition of the magma, and temperature. andesite basalt dacite rhyolite? SURVEY . Viscosity is the measure of the resistance to flow by a fluid. 3. Magma contains a mixture of gases and simple elements. However, if the magma is viscous, like rhyolite, its high polymerization will impede the upward mobility of . Rhyolitic Magma. Tags: Question 6 . high-viscosity, low-volume silicic magmas that are erupted from the summit . Basaltic Magma. Helens, argently as in eruptions of Kilauea on the island of Hawai • High-viscosity magmas generally produce explosive eruptions • LOW-viscosity . Explosive eruptions involve either a combination of sudden expansion and escape of volcanic gas from rising magma or . Among the three, basalt has the lowest silica content and that would mean that its' viscosity is the lowest among the given. It is distributed across divergent plate boundaries, hot spots, convergent plate boundaries. . : - Part A - Magma viscosity and eruption style Magma viscosity ("resistance to flow) is the primary factor aflecting whether volcanoes erupt Volantly as in the 1980 eruption of Mt. This magma can push through holes or cracks in the crust, causing a volcanic eruption. What are the 3 types of magma? Basaltic magmas have the lowest viscosity of all magma types, meaning that they are 'thinner' and more free-flowing - although it is still usually between 15,000 . A high volatile content decreases viscosity (like adding water to . Rhyolitic magmas tend to have even higher viscosity, ranging . Felsic magma has the highest silica content of all magma types, between 65-70%. The higher the number of bonds, the higher the viscosity!One way to change the viscosity of a magma is too add water.Water has the effect of depolymerizing (6) magmas. Felsic magma can hold more water and carbon dioxide in solution than can mafic magma. Gases rich in sulfur dioxide. Basaltic magma — SiO 2 45-55 wt%, high in Fe, Mg, Ca, low in K, Na. Vocabulary. The more trapped gas the more violent the explosion. QUESTION 1 Which magma type would generally have the lowest viscosity? Eruptions tend to be mild in comparison to other volcanoes, but lava flows can destroy property and vegetation. The lower the silica content, the lower the viscosity. basalt andesite dacite rhyolite 1 points Save Answer QUESTION Pahoehoe Flows - Basaltic lava flows with low viscosity start to cool when exposed to the low temperature of the atmosphere. These magma's have a low viscosity since the lower the SiO2-content, the lower the viscosity; and hence flow easily (↔ . Different magma types behave differently as lava flows, depending on their temperature, viscosity, and gas content. Generally, the magmas are considered into four types: Ultramafic The temperature of the ultramafic magma reaches up to 1500 degree Celcius. Magma is typically found several kilometers from the surface of the earth or in areas . Basaltic (or mafic) magma has the lowest viscosity. Low viscosity magma. Before cooling, mafic lava has a very low viscosity. 2. Questions to Answer: 1. QUESTION 1 Which magma type would generally have the lowest viscosity? Everyday examples are water (low viscosity) and hot tar (high viscosity). It has a very low viscosity (Which leads to gentler and less explosive eruptions). You can measure lava . Why does magma have high silica . Familiar fluids range in viscosity. For example: a basaltic magma. A high volatile content decreases viscosity (like . Magma Viscosity. A) rhyolite, andesite, basalt B) andesite, rhyolite, basalt C) basalt, rhyolite, andesite Mafic There are three basic types of magma: basaltic, andesitic, and rhyolitic, each of which has a different mineral composition. Magma is extremely hot liquid and semi-liquid rock located under Earth's surface. The low viscosity magma can flow not only on the surface as lava, but also underground in lava tubes. Water has low viscosity, while corn syrup, for example, is highly viscous. True. It is said that the higher the silica content, the higher the viscosity. At the other end of the spectrum we have magma that is formed from 'felsic' volcanic rock, which has a much higher silicon content . ∙ 2010-11-18 00:03:27. A low-viscosity magma, like basalt, will allow the escaping gases to migrate rapidly through the magma and escape to the surface. Silicon and oxygen are the most abundant; geologist, therefore, define magma in terms of the silica and gas content, viscosity, and temperature. Controls on Explosive Eruption Styles. Which magma type would generally have the lowest viscosity? The different types of magma are generally determined by the chemical composition, which is based on what materials have been melted or otherwise incorporated into the magma. Question. The high temperatures and pressure under Earth's crust keep magma in its fluid state. A high volatile content decreases viscosity (like adding water to . Atlantic Indian Pacific Arctic 1 points Save Answer QUESTION 3 ________ are usually the most abundant gases emitted during basaltic volcanism. All types of magma have a significant percentage of silicon . The silica dissolved in the liquid part of magma tends to link together into molecular chains-the more silica, the more . However, because the low diffusion and high viscosity in felsic magma limits bubble growth, felsic magma supports smaller bubbles (0.001-0.1 cm) than mafic magma (0.1 - 5 cm). basalt. When magma rises to the surface it experiences a decrease in pressure, and this causes a decrease in the solubility of gaseous components such as water and carbon dioxide. A liquid is said to have a high viscosity if it flows slowly and a low viscosity if it flows freely. The below picture is of the mafic rock basalt. What are the 3 major types of magma? This type of magma has a low gas content and low viscosity, or resistance to flow. 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. A) High viscosity and dissolved gas Which magma type would generally have the lowest viscosity? This causes a surface . Viscosity is the property of a substance to internally resist flow. Magma viscosity is highly dependent on the composition of the magma. THIS USER ASKED Which magma type would generally have the lowest viscosity? gentle, sloping sides. Explosive bursting of bubbles will fragment the magma into clots of liquid that will cool as they fall through the air. Magmas with high silica content have a high viscosity (resistance to flow) and are generally more explosive when eruptions occur. 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. See answer (1) Best Answer. It is said that the… Magma invariably contains small amounts of dissolved gas (water, CO 2 etc) which is released as pressure is removed. . Andesitic magma — SiO 2 55-65 wt%, intermediate. 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. SURVEY . All magmas also contain some degree of trapped gasses (CO2 & H2O ). A. Magma (Characteristics, Types, Sources, and Evolution) Higher SiO2(silica) content magmas have higher viscosity 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 . 30 seconds . Magma or hot molten rock beneath the earth's surface has an average temperature of around 1300 degrees F to 2400 degrees F or 700 degrees C to 1300 degrees C. Komatiite magma, in particular, can reach the temperature of 1600 degrees Celsius.. Magma formation depends on the type of environment it is formed. It also has a low content of gas and viscosity. Stephen Blake, in Encyclopedia of Geology (Second Edition), 2021. Lower temperature magmas have higher viscosity than higher temperature magmas (viscosity decreases with increasing temperature of the magma). Powerful, explosive, volcanic eruptions can result in climatic cooling for millions of years following the eruption. A magma containing not much silica (= SiO2). Magma invariably contains small amounts of dissolved gas (water, CO 2 etc) which is released as pressure is removed. in Fe, Mg, Ca, Na, K. Learn more about the different types of magma - here (slideshow). T here are three basic types of magma: basaltic, andesitic, and rhyolitic, each of which has a different mineral/chemical composition. basalt andesite dacite rhyolite 1 points Save Answer QUESTION 2 The ________ ocean basin is rimmed by the most subduction zones. Types of Magmas. If, on the other hand, the lava has a high viscosity (thick and pasty with a high gas and silica content) it is called Aa. Mafic magma also has high mean temperatures, between 1000 o and 2000 o Celsius (1832 o and 3632 o Fahrenheit), which contributes to its lower viscosity. Felsic Magmas: The rocks that form from this type of magma are representative of continental rocks. Earth has a layered structure that consists of the inner core, outer core, mantle, and crust. Which type of magma has the lowest gas content? OK, so what does viscosity have to do with silica? When it comes to liquids, viscosity is a measurement of how thick or syrupy it is. . Viscosity depends on primarily on the composition of the magma, and temperature. In magmas, viscosity (14) is created by the number of bonds between SiO2 tetrahedrons (11) (O-O bond). Wiki User. which magma type would generally have the lowest viscosity? High viscosity magma. View Test Prep - ch 9 quiz from EARTH 106 at MiraCosta College. Water has low viscosity (flows easily) while syrup and honey have greater viscosity. Example: Pine Sap or Molasses (High Viscosity) vs. Water (Low Viscosity) The HIGHER the viscosity, the more 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). List and define each of the three major types of volcanoes and give one example of each. Which magma type would generally have the lowest viscosity? THIS IS THE BEST ANSWER Viscosity is defined as resistance to flow. Different magmas have different viscosities. A) basalt B) andesite C) dacite D) rhyolite A) basalt Which one of the following shows the correct order (left to right) of decreasing magma viscosity? Mafic magma has relatively low silica content, roughly 50%, and higher contents in iron and magnesium. Which type of magma/lava has the lowest viscosity and least violent eruptions and which has the highest viscosity and the most violent eruptions? . Lava Viscosity. Andesitic Magma. All magma that reaches the surface can be classified as Lava. This type of magma has low silica content but higher contents of magnesium and iron. The Eruption Column The most well known shield volcano is Hawaii. Viscosity is the resistance to flow (opposite of fluidity). answer choices . The magma types vary from mafic magmas, which have relatively low silica and high Fe and Mg contents, . Much of the planet's mantle consists of magma. Mafic rocks are also often distinguished by their dark color. As a result these magmas are quite dense in comparison with felsic magmas. Italicized rocks indicate the presence of . 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. The viscosity of magma highly depends on the composition of the magma. blue names are the igneous rock types. The higher the silica . The character of volcanic eruptions are largely controlled by the viscosity - " gooeyness " or resistance to flow - of the magma: Low viscosity fluids flow more easily than high viscosity fluids. The viscosity of magma highly depends on the composition of the magma. Copy. The low levels of silica mean that Hawaiian magma has a low viscosity, which explains why we see lava readily cascading downslope, and being churned up in the air in great fire fountains. in Fe, Mg, Ca, Na, K Rhyolitic magma -- SiO 2 65-75%, low in Fe, Mg, Ca, high in K, Na Gases in Magmas There are three basic types of magma: basaltic, andesitic, and rhyolitic, each of which has a different mineral composition. Mafic Magma . The low viscosity also means that shield eruptions are non-explosive. Types of magma are determined by chemical composition of the magma. Since it its a liquid, it flows downhill in response to gravity as a lava flows. This answer is: Helpful ( 0) Explosive eruptions are favored by high gas content and high viscosity (andesitic to rhyolitic magmas). Tags: Question 11 . Of the magma, and crust < /a > types of magma - here ( slideshow.. The viscosity of magma: basaltic, andesitic, and rhyolitic, of! 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