What Are The Two Main Factors That Determine The Viscosity Of Magma?


What Are The Two Main Factors That Determine The Viscosity Of Magma??

The viscosity of magma depends upon its silica content and temperature.

What are two factors that determine the viscosity of magma?

Viscosity of Magmas

Viscosity depends on primarily on the composition of the magma and temperature.

What are the factors of viscosity of magma?

The three factors that influence the viscosity of a lava are temperature the dissolved gases it contains and its chemical composition.

What factors determine magma characteristics?

The factors that mainly affect in the formation of magma can be summarized into three: Temperature Pressure and composition. Temperature plays a role in the formation of the melts in the magma. Generally magma has a temperature range from 700-1300 degrees Celsius.

What factors decrease viscosity of magma?

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. On the other hand when the temperature is raised the viscosity decreases.

What are the top two compositions of magma?

Magma Composition
  • Mafic magmas are low in silica and contain more dark magnesium- and iron-rich mafic minerals such as olivine and pyroxene.
  • Felsic magmas are higher in silica and contain lighter colored minerals such as quartz and orthoclase feldspar.

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What are the three factors that influence viscosity of a lava quizlet?

Three factors that affect magma viscosity are temperature composition and presence of dissolved gases.

What two factors control the explosiveness of an eruption?

Magma composition is discussed below followed by a description of the controlling factors on explosivity — viscosity temperature and the amount of dissolved gases in the magma.

What is fluid viscosity?

viscosity resistance of a fluid (liquid or gas) to a change in shape or movement of neighbouring portions relative to one another. Viscosity denotes opposition to flow. The reciprocal of the viscosity is called the fluidity a measure of the ease of flow. Molasses for example has a greater viscosity than water.

How viscosity affects the movement of magma?

Heating reduces viscosity (warm syrup flows more easily than cold.) High viscosity lavas flow slowly and typically cover small areas. In contrast low viscosity magmas flow more rapidly and form lava flows that cover thousands of square kilometers.

What are the two primary factors that determine how magma erupts?

The two primary factors that determine how magma erupts is its viscosity and gas content.

What is the two composition of magma?

Like solid rock magma is a mixture of minerals. It also contains small amounts of dissolved gases such as water vapor carbon dioxide and sulfur. The high temperatures and pressure under Earth’s crust keep magma in its fluid state.

What 2 factors affect the type of igneous rock that is formed?

The two major factors that influence the creation of igneous rocks are the original rock that was melted and the cooling history of the molten rocks.

Which of the following increases the viscosity of magma?

The viscosity of magma increases with: high % silica and cooler temperatures.

Which characteristics of magma determines its explosiveness?

Viscosity together with the amount of gas dissolved in magma can determine the explosivity of the eruption. More viscous magma with volatiles is more explosive than less viscous magma where gases can bubble out relatively easily.

What type of magma would have the highest viscosity?

rhyolitic magma

The magma that has the highest viscosity is rhyolitic magma.

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How is magma composition related to viscosity?

Magmas differ in composition which affects viscosity. Magma composition has a large effect on how a volcano erupts. Felsic lavas are more viscous and erupt explosively or do not erupt. Mafic lavas are less viscous and erupt effusively.

What 3 factors affect the formation of magma?

What three factors affect the formation of magma? Pressure water and temperature.

What factors control the cooling time of magma within the crust?

What factors control the cooling times of a magma within the crust? The depth of the intrusion the shape and size of a magma body: the greater the surface area for a given volume of intrusion the faster it cools and the presence of circulating ground water: water passing through magma absorbs and carries away heat.

What are the three factors that influence viscosity of lava?

Temperature composition and volatile (gas) content largely determine the viscosity of lava.

What two factors control the explosiveness of an eruption quizlet?

What two factors control the explosiveness of an eruption? The amount of water vapor and silica in the magma.

What is one factor that determines how explosive a volcanic eruption quizlet?

A magma with high silica (>60%) will be quite viscous and so the eruption will be violent. One other factor is the amount of dissolved volatiles in the magma (chlorine gas water and other gases). A magma with a lot of dissolved gases will form a lot of large bubbles.

What are the two most abundant gases in magmas?

The most abundant volatile in magma is water (H2O) followed typically by carbon dioxide (CO2) and then by sulphur dioxide (SO2).

What are the three factors that determine how explosive a volcano is?

An eruption explosive or otherwise depends on three fundamental factors: the nature of the magma the depth of the magma chamber below the surface and the excess pressure built up in the magma chamber (compared to what the pressure would be if an unobstructed column of magma extended to the surface).

What is the main factor that determines how volcanoes erupt?

The style of eruption depends on a number of factors including the magma chemistry and content temperature viscosity (how runny the magma is) volume and how much water and gas is in it the presence of groundwater and the plumbing of the volcano.

How is viscosity determined?

The viscous properties of a liquid or amorphous solid are primarily determined by inter-particle forces within the solution including friction and attraction between molecules in the macrostructure. … Dynamic viscosity which is a measure of the shear stress per unit area required before a sample begins to deform.

What are the factors that affects viscosity?

Viscosity is resistance to flow. For liquids typically the larger the intermolecular forces (IMF) the higher the viscosity. The other factors that affect viscosity are temperature and the shape of the molecule.

What causes viscosity?

Viscosity is a measure of the resistance of a fluid towards being deformed when under shear stress. Hence it is also known as shear viscosity. It is caused by the attractive forces between molecules in close contact and the friction between molecular chains.

What is viscosity in lava?

When it comes to liquids viscosity is a measurement of how thick or syrupy it is. … And the lava viscosity defines the size and shape of a volcano. Even though lava is 100 000 times more viscous than water it can still flow great distances. When lava has low viscosity it can flow very easily over long distances.

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How does viscosity affect volcanic eruptions?

Viscosity is the ability of a liquid to resist flowing. This means liquids with a higher viscosity are thicker and do not flow as easily. … Magmas with a higher SiO2 content have a higher viscosity. Ultimately the viscosity of a magma will determine the shape a volcano takes over continued eruptions.

Which type of eruption will give the most viscous magma?

Explosive eruptions

Explosive eruptions are favored by high gas content & high viscosity magmas (andesitic to rhyolitic magmas).

How the composition of magma determines an eruption’s characteristics?

How does the composition of magma determine an eruption’s characteristics? Silica content determines viscosity and the amount of dissolved gases help determine explosivity. … The more viscous the magma the more explosive the eruption.

How does temperature and composition of the magma affects its viscosity?

Viscosity of magma the resistance to flow depends on composition of the magma and temperature. Higher silica content means higher viscosity. But lower temperatures and low gas content mean higher viscosity. Hence lower viscosity and low gas content mean higher temperature of magma.

What are 2 major factors that make metamorphic rocks?

Temperature and pressure are important factors in determining the new minerals that form in a metamorphic rock.

Magma Viscosity Gas Content & Milkshakes

Magma Viscosity

Magma Viscosity

Magma Formation | Second Quarter | Lesson 3 | Earth Science

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