What determines the viscosity of magma quizlet?
The viscosity of magma depends upon its silica content and temperature.
What factors control viscosity of lava?
Temperature, composition, and volatile (gas) content largely determine the viscosity of lava. Temperature: The hotter the lava, the lower the viscosity (the thinner it is). The cooler the lava, the higher the viscosity (the thicker it is).
What increases the viscosity of magma?
Viscosity is anti-correlated to temperature by the fact that a lower temperature means a higher viscosity. In other words, as magma cools, its viscosity increases.
What is viscosity and what factors influence the viscosity of magma?
Viscosity is a fluid's resistance to flow. Three factors that affect magma viscosity are temperature, composition, and presence of dissolved gases. Explain how the viscosity of magma influences the explosiveness of a volcano. More viscous magmas tend to generate more explosive eruptions.
What two things does the viscosity of magma depend on?
The viscosity of a magma is affected by its silica content and temperature. 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.
Which of the following increases the viscosity of magma quizlet?
The viscosity of magma increases with: high % silica and cooler temperatures.
How does silica affect viscosity of magma?
The amount of silica in magma helps to determine its viscosity. The more silica magma contains the higher its viscosity. Magma that is high in silica produces light-colored lava that is too sticky to flow very far ex. … Low-silica magma flows readily and produces dark-colored lava ex.
How can viscosity control the shape of a volcano?
Ultimately, the viscosity of a magma will determine the shape a volcano takes over continued eruptions. A magma's silica content will not only control the rock type that forms, it also controls the relative viscosity of the magma. Differences in a magma's viscosity will determine the shape a volcano takes.
What’s the viscosity magma?
Magma viscosity varies, with temperature, water content, and composition, between about 102 Pa s and about 1011 Pa s.
How does viscosity affect magma?
Differences in a magma's viscosity will determine the shape a volcano takes. High-silica (basalt) magma has a much lower viscosity. It flows much easier and over longer distances. As low-silica magma cools, it hardens to rock, adding a new thin layer of rock to the volcano.
What are the 3 factors of viscosity?
Those are:
- Fluid Temperature: Usually the viscosity of liquids decreases with an increase in temperature. …
- Flow Conditions: For laminar flow the viscosity of liquid remains constant while for turbulent flow viscosity changes.
- Pressure: With an increase in pressure, the viscosity of gases usually increase.
Which of the following are ways that viscosity affects gases in magma?
Which of the following are ways that viscosity affects gases in magma? Viscous magma prevents gas from escaping easily.
Which of the following factors influences the viscosity of magma select all that apply?
Three factors that affect magma viscosity are temperature, composition, and presence of dissolved gases.
Which of the following would decrease the viscosity of magma?
Which of the following would decrease the viscosity of magma? The more the silica in magma, the lower the viscosity.
What effect does silica have on viscosity?
A magma's silica content will not only control the rock type that forms, it also controls the relative viscosity of the magma. Differences in a magma's viscosity will determine the shape a volcano takes. High-silica (basalt) magma has a much lower viscosity. It flows much easier and over longer distances.
Which of the following factors makes magma less viscous?
Gas dissolved in magma (mostly water, carbon dioxide, and sulfur dioxide) makes the magma less viscous. Viscosity describes a fluid's resistance to flow, or how thick or sticky the fluid is.
What does silica do to lava?
Silica: Influences lava viscosity and overall shape of the volcano. Silica molecules form a strong bond that permits entrapment of volcanic gases and promotes explosive volcanic eruptions. Low-silican magmas allow rapid escape of gases and low-explosivity eruptions.
What does viscosity depend on?
The viscosity of a liquid usually depends on its temperature. Viscosity generally decreases as the temperature increases. Viscosity generally increases as the temperature decreases. The viscosity of a liquid is related to the ease with which the molecules can move with respect to one another.
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 magma?
Viscosity of Magmas Viscosity is the resistance to flow (opposite of fluidity). Viscosity depends on primarily on the composition of the magma, and temperature. Higher SiO2 (silica) content magmas have higher viscosity than lower SiO2 content magmas (viscosity increases with increasing SiO2 concentration in the magma).
What does silica do to magma?
The silica content of the magma determines how thick the magma is, how easily it flows and how easily dissolved gases within the magma can escape; therefore the silica content determines the characteristic of the volcanic eruption and the shape and size of the resulting volcanic cone.
What is viscosity of magma?
Magma viscosity varies, with temperature, water content, and composition, between about 102 Pa s and about 1011 Pa s.
Which of the following are ways that viscosity affects gasses in magma?
Which of the following are ways that viscosity affects gases in magma? Viscous magma prevents gas from escaping easily.
How does the amount of gases in magma affect viscosity?
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.
Why does silica affect viscosity?
Why does silica content affect viscosity? Magmas that have a high silica content will therefore exhibit greater degrees of polymerization and have higher viscosities than those with low-silica contents.
How is silica and viscosity related?
Viscosity depends on primarily on the composition of the magma and temperature. Higher SiO2 (silica) content magmas have higher viscosity than lower SiO2 content magmas (viscosity increases with increasing SiO2 concentration in the magma).
What are the 3 factors that affect viscosity?
Those are:
- Fluid Temperature: Usually the viscosity of liquids decreases with an increase in temperature. …
- Flow Conditions: For laminar flow the viscosity of liquid remains constant while for turbulent flow viscosity changes.
- Pressure: With an increase in pressure, the viscosity of gases usually increase.
Is viscosity dependent on temperature?
Viscosity depends strongly on temperature. In liquids it usually decreases with increasing temperature, whereas, in most gases, viscosity increases with increasing temperature.
Does viscosity depend on temperature?
The viscosity of liquids decreases rapidly with an increase in temperature, and the viscosity of gases increases with an increase in temperature. Thus, upon heating, liquids flow more easily, whereas gases flow more sluggishly.
What is the basic cause of viscosity in liquid?
Due to strong cohesive forces between the molecules, any layer in a moving fluid tries to drag the adjacent layer to move with an equal speed and thus produces the effect of viscosity.