Which of the following increases the viscosity of magma?
The viscosity of magma increases with: high % silica and cooler temperatures.
Why is rhyolitic magma highest viscosity?
Magma Composition:
Such magmas erupt as andesites and rhyolites or are intruded as granite masses. The more extensive silicate chain molecules render these magmas highly viscous, so when eruption occurs it is usually explosive (e.g. Mt St Helens).
What makes lava more viscous?
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.
Do shield volcanoes have high or low viscosity?
Shield volcanoes are formed by lava flows of low viscosity – lava that flows easily. Consequently, a volcanic mountain having a broad profile is built up over time by flow after flow of relatively fluid basaltic lava issuing from vents or fissures on the surface of the volcano.
What type of magma has the highest silica content quizlet?
RHYOLITIC magma contains more than 65% SILICA and is referred to as FELSIC. ANDESITIC magma is INTERMEDIATE in composition (55-65% SILICA). When these magmas erupt onto earth’s surface, each lava type solidifies to produce a different volcanic rock – BASALT, ANDESITE, and RHYOLITE.
Why is higher silica magma or lava more viscous quizlet?
Higher silica increases 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.
Why is viscous magma more 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. The amount of gas in the magma helps determine how explosive the eruption will be. … Viscous lava flows tend not to flow far and therefore build up steep slopes.
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.
What are types of magma?
The high temperatures and pressure under Earth’s crust keep magma in its fluid state. There are three basic types of magma: basaltic, andesitic, and rhyolitic, each of which has a different mineral composition.What is the viscosity of andesitic magma?
102 to 107 Pa s
Andesitic magmas, in particular, have a wide range of magma viscosities, from 102 to 107 Pa s, which is due to a wide range in phenocryst contents from 0 (phenocryst‐free andesitic melt) to ∼50 vol % (50 vol % rhyolitic melt + 50 vol % phenocrysts).Which chemical component of magma has the highest content?
Oxygen, the most abundant element in magma, comprises a little less than half the total, followed by silicon at just over one-quarter. The remaining elements make up the other one-quarter. Magmas derived from crustal material are dominated by oxygen, silicon, aluminum, sodium, and potassium.
Which magma composition contains the most silica SiO2 and therefore has the highest viscosity?
Granitic magma is thick and stiff and contains lots of silica and dissolved gasses. Granitic magma has the most silica and has the highest viscosity. 34) andesitic magma Andesetic magma has an intermediate amount of silica which gives it an intermediate viscosity, in between basaltic and granitic magmas.
Which of the given fluid has 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.
Which of the following liquid has high viscosity?
The viscosity of a liquid is a measure of its resistance to flow. Water, gasoline, and other liquids that flow freely have a low viscosity. Honey, syrup, motor oil, and other liquids that do not flow freely, like those shown in Figure 1, have higher viscosities.
Which of the following liquid has the maximum viscosity?
Among glycol, ethanol and water, the liquid with maximum viscosity is glycol because glycol exhibits stronger hydrogen bonding than ethanol and water due to the presence of two −OH groups.
What is a highly viscous liquid?
A highly viscous fluid tends to be thick, like honey or cold maple syrup. Compared to a relatively nonviscous fluid, such as water, highly viscous liquids flow much more slowly.
Is a high viscosity thicker or thinner?
The higher the viscosity of a liquid, the thicker it is and the greater the resistance to flow.
How do you know which substance has the highest viscosity?
Viscosity is governed by the strength of intermolecular forces and especially by the shapes of the molecules of a liquid. Liquids whose molecules are polar or can form hydrogen bonds are usually more viscous than similar nonpolar substances.
What magma contains the most silica?
Rhyolitic magma
Rhyolitic magma contains the most silica. Silica is a chemical compound with the formula SiO2.Which of the following elements has the highest amount in the magma?
Oxygen, the most abundant element in magma, comprises a little less than half the total, followed by silicon at just over one-quarter. The remaining elements make up the other one-quarter. Magmas derived from crustal material are dominated by oxygen, silicon, aluminum, sodium, and potassium.
Which of the following type of magma has the high gas and silica content *?
Of all the types of magma that exist, felsic magma has the most silica in it. 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.What is the viscosity of the lava?
With such a high silica content, these lavas are extremely viscous, ranging from 108 cP for hot rhyolite lava at 1,200 °C (2,190 °F) to 1011 cP for cool rhyolite lava at 800 °C (1,470 °F). For comparison, water has a viscosity of about 1 cP.
Magma Viscosity, Gas Content & Milkshakes
Which Magma has the highest viscosity? Volcanoes Quiz
Magma Viscosity
Igneous Petrology- viscosity, volatile content, partial melting, and mixing of magma | GEO GIRL
Related Searches
rhyolitic magma
what does it mean by lower viscosity magma
how is the percentage of silica content of magma related to its viscosity
basaltic magma
how magma is formed
is basaltic magma fluid or viscous
what type of magma has the lowest viscosity
andesitic magma
