Quick Answer: What Is Viscosity In Volcanoes?

What are the factors that affect 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.

Higher temperatures will correspond to higher average kinetic energies and faster moving molecules..

Where are most volcanoes located?

Pacific OceanSixty percent of all active volcanoes occur at the boundaries between tectonic plates. Most volcanoes are found along a belt, called the “Ring of Fire” that encircles the Pacific Ocean.

Which lava has the highest viscosity?

rhyoliticThe magma that has the highest viscosity is rhyolitic magma.

Why does silica increase viscosity?

In other words, as magma cools, its viscosity increases. This property is increased by crystallization of magma while temperature decreases. Finally, the composition of a magma highly affects its viscosity. A higher concentration in silica leads to a more acid/more viscous magma.

What are the 3 major types of magma?

There are three basic types of magma: basaltic, andesitic, and rhyolitic, each of which has a different mineral composition. All types of magma have a significant percentage of silicon dioxide. Basaltic magma is high in iron, magnesium, and calcium but low in potassium and sodium.

How is viscosity calculated?

You can measure the viscosity of a liquid by measuring the velocity of a sphere as it falls through the liquid. The velocity of the sphere, combined with the relative densities of the sphere and the liquid, can be used to calculate the viscosity of the liquid.

What type of lava has the lowest viscosity?

basaltic lavaAn example of a low viscosity (fast flowing) lava is basaltic lava. This flows quickly out of a volcano at a temperature of about 950 degrees Celsius.

What is viscosity volcanic?

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 type of volcano has high viscosity?

Lavas and pyroclastics are usually andesitic to rhyolitic in composition. Due to the higher viscosity of magmas erupted from these volcanoes, they are usually more explosive than shield volcanoes. Stratovolcanoes sometimes have a crater at the summit that is formed by explosive ejection of material from a central vent.

Does temperature affect viscosity?

With an increase in temperature, there is typically an increase in the molecular interchange as molecules move faster in higher temperatures. With high temperatures, viscosity increases in gases and decreases in liquids, the drag force will do the same. …

Does water viscosity change with temperature?

When the liquid is heated up, the molecules have more kinetic energy and so they can more easily break free of these forces–the liquid will become less viscous.

Which type of volcano is the most explosive?

Composite volcanoesComposite volcanoes are some of the most dangerous volcanoes on the planet. They tend to occur along oceanic-to-oceanic or oceanic-to-continental boundaries because of subduction zones. They tend to be made of felsic to intermediate rock and the viscosity of the lava means that eruptions tend to be explosive.

How does viscosity affect volcanoes?

The viscosity of the magma, however, is also an important factor in determining whether an eruption will be explosive or nonexplosive. A low-viscosity magma, like basalt, will allow the escaping gases to migrate rapidly through the magma and escape to the surface.

What does viscosity mean?

Viscosity is a measure of a fluid’s resistance to flow. It describes the internal friction of a moving fluid. A fluidwith large viscosity resists motion because its molecular makeup gives it a lot of internal friction.

What determines lava 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.