What creates high lava 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. 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.
Which element makes lava more viscous?
silica The chemical composition, or the elements that make up the magma, influences the viscosity of the magma, which in turn can make the eruption more or less explosive. Felsic magma has more silica and alumina content, which makes magma more viscous. Mafic magma has less silica content and more iron and magnesium in it.
What element controls the viscosity of lava?
A magma's silica content will not only control the rock type that forms, it also controls the relative viscosity of the magma.
What is lava with a high viscosity?
When lava has a high viscosity, it's very thick and doesn't flow very well at all. Instead of rivers of lava, you can get crumbling piles of rock flowing down hill. It can also clog up the volcanic vent and form blocks that resist the flow of lava.
Which substance affects the viscosity of magma?
A magma's viscosity is largely controlled by its temperature composition and gas content (see downloadable programs at the bottom of this page). The effect of temperature on viscosity is intuitive. Like most liquids the higher the temperature the more fluid a substance becomes thus lowering its viscosity.
Which mineral has the highest viscosity?
The magma that has the highest viscosity is rhyolitic magma.
What substance determines the viscosity of magma?
A magma's viscosity is largely controlled by its temperature composition and gas content (see downloadable programs at the bottom of this page). The effect of temperature on viscosity is intuitive. Like most liquids the higher the temperature the more fluid a substance becomes thus lowering its viscosity.
Which is likely to have highest viscosity in the composition of magma?
The magma that has the highest viscosity is rhyolitic magma.
What determines the viscosity of lava quizlet?
–Lava – molten rock at the surface. -Viscosity depends upon temperature & magma composition (most important).
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.
Why does silica make magma more viscous?
Silicon dioxide, the most abundant rock-forming compound on Earth and the predominant molecular constituent of volcanic rocks and magmas. It tends to polymerize into molecular chains, increasing the viscosity of the magma.
What fluids have a high viscosity?
Honey, syrup, motor oil, and other liquids that do not flow freely, like those shown in Figure 1, have higher viscosities.
Which of these liquids has the highest viscosity?
Syrup has the highest viscosity.
What magma has the highest viscosity?
The magma that has the highest viscosity is rhyolitic magma.
Why does silica increase viscosity?
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). Composition: he more felsic the lava (the more silica in the lava), the higher the viscosity because silica forms chains in the cooling lava even before it crystallizes.
Which of the following have higher viscosity?
Viscosity is a measure of how much a Substance resists flowing freely. Solids have high viscosity because they cannot flow freely.
What are the three factors that influence viscosity of lava?
The three factors that influence the viscosity of a lava are temperature, the dissolved gases it contains, and its chemical composition.
What are the two primary factors that influence the viscosity of magma and lava?
a. 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.
What condition is needed to increase the viscosity of magma?
Lower temperature magmas have higher viscosity than higher temperature magmas (viscosity decreases with increasing temperature of the magma).
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 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.
Which is the highest viscosity?
The correct answer is Honey. Viscosity: S I unit: Pascal seconds (Pa·s) or kg·m−1·s−1. It is the property of a liquid representing the internal resistance of its different layers to motion.
What has a high viscosity?
Some liquids, like pitch, glass and peanut butter, have such high viscosity they behave like solids. In common vernacular, a liquid is said to be “viscous” if its viscosity is substantially greater than that of water, and is described as “mobile” if the viscosity is noticeably less than water.
What factors affect the viscosity of magma?
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).
Which of the following compositions would result in a magma with high viscosity?
2. Composition (silica content): the more mafic the lava (less silica) the lower the viscosity; the more felsic the lava (more silica) the higher the viscosity.
What is silica in lava?
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 Magma has the highest viscosity?
The magma that has the highest viscosity is rhyolitic magma.
Which gas has highest viscosity?
Of all fluids, gases have the lowest viscosities, and thick liquids have the highest….Noble gases.
| Substance | Helium |
|---|---|
| Molecular formula | He |
| Viscosity (μPa·s) | 19.85 |
| Thermal conductivity (W m−1K−1) | 0.153 |
| Specific heat (J K−1kg−1) | 3116 |
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 lava characteristics greatly affect the viscosity of a lava?
Viscosity of Magmas Depends on composition, temperature, & gas content. Lower Temperature magmas have higher viscosity than higher temperature magmas.