The magma that has the highest viscosity is rhyolitic magma.

What is very viscous magma?

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 is the most viscous lava?

An example of high viscosity lava is felsic lava, like rhyolite or dacite. It erupts at lower temperatures, and can flow for tens of kilometers.

Is felsic magma the most viscous?

Felsic magma has more silica and alumina content, which makes magma more viscous. ... Viscous lava flows tend not to flow far and therefore build up steep slopes. Viscosity is determined by its composition and temperature: Felsic lava is more viscous than mafic lava.

Which magma is more viscous quizlet?

The thicker magma is, the higher the viscosity. Describe magma with a high viscosity. Magma with a high viscosity is cooler in temperature, has a high amount of silica, and is Granitic/Andesitic. Describe magma with a low viscosity.

Magma Viscosity, Gas Content & Milkshakes

22 related questions found

What type of magma has the lowest viscosity?

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. Rhyolitic magmas tend to have even higher viscosity, ranging between 1 million and 100 million times more viscous than water.

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.

What is highly viscous?

A fluid that is highly viscous has a high resistance (like having more friction) and flows slower than a low-viscosity fluid. To think of viscosity in everyday terms, the easier a fluid moves, the lower the viscosity. ... Honey would move slower than water, so honey would have a greater viscosity.

Is more viscous than mafic magma?

Felsic magma is more viscous than mafic magma but the felsic continental crust is less denser than the mafic oceanic crust.

Is mafic or felsic more viscous?

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. The more mafic the lava (the less silica in it), the lower the viscosity.

Which lava is more viscous acidic or basic?

Acidic lava is very viscous (sticky). Steep sides as the lava doesn't flow very far before it solidifies. Alternate layers of ash and lava. For this reason, they're also known as stratovolcanoes.

Which type of magma has the highest silica content and viscosity?

Felsic magma has the highest silica content of all magma types, between 65-70%. Thick, viscous felsic magma can trap gas bubbles in a volcano's magma chamber.

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.

Which is more viscous basaltic or granitic magma?

(c) basaltic magma = 50% silica. ... Thus granitic magmas are more viscous than basaltic magmas.

What is the viscosity of andesitic magma?

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 of the following liquid is most viscous?

Viscosity of the different fluids (in cP) is as follows: Edible Oil: 20 to 60; Milk: approximately 1.0; Water: 0.894; and Petrol: around 0.82 to 0.95 cP.

What is the viscosity of mafic lava magma?

Mafic magma is not viscous and will flow easily to the surface. Felsic magma is viscous and does not flow easily. Most felsic magma will stay deeper in the crust and will cool to form igneous intrusive rocks such as granite and granodiorite.

What is fluid viscosity?

Viscosity is a measure of a fluid's resistance to flow.

A fluid with low viscosity flows easily because its molecular makeup results in very little friction when it is in motion. Gases also have viscosity, although it is a little harder to notice it in ordinary circumstances.

Which of the following best explains why felsic magma is more viscous than mafic magma?

High-viscosity lava does not flow quickly. ... Which of the following best explains why felsic magma is more viscous than mafic magma? Felsic magma contains more silica. Which volcanically active location is most likely to have a fissure eruption?

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 is viscosity physics?

Viscosity is the 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.

What is high viscosity example?

Fluids with low viscosity have a low resistance and shear easily and the molecules flow quickly; high viscosity fluids move sluggishly and resist deformation. Some liquids, like pitch, glass and peanut butter, have such high viscosity they behave like solids. ... For example, water at 20°C has a viscosity of 1.002 cPs.

Which magma composition contains the most silica SiO2 and therefore has the highest viscosity?

RHYOLITIC magma contains more than 65% SILICA and is referred to as FELSIC.

Which type of magma would flow faster due to a lower 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.