What Is The Major Ingredient In A Magma That Determines Whether It Has High Or Low Viscosity?

What Is The Major Ingredient In A Magma That Determines Whether It Has High Or Low Viscosity??


What is the major ingredient in a magma that determines whether it has high or low viscosity group of answer choices?

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 of the following determines whether a volcanic eruption is violent or more passive group of answer choices?

The viscosity in turn helps determine whether the eruption will be violent or quiet. The viscosity is least for very hot magmas with relatively low silica content. The gases dissolved in the molten material provide the force to propel the liquid rock from the volcano.

What is the minimum number of location data points needed in order to determine the location of the epicenter of an earthquake?

When seismic data is collected from at least three different locations it can be used to determine the epicenter by where it intersects. Every earthquake is recorded on numerous seismographs located in different directions.

Do earthquakes occur when rock masses break and slip past one another along a fault?

Earthquakes occur when rock masses break and slip past one another along a fault. Surface waves travel through Earth rather than around it. The focus is the point on a fault where energy is first released during an earthquake. … The deepest and most powerful earthquakes occur in subduction zone environments.

What is the major composition 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.

See also how many elements make up 98 of earth’s crust

What happens when magma is formed?

Magma cools and crystallizes to form igneous rock. … As the metamorphic rock is buried more deeply (or as it is squeezed by plate tectonic pressures) temperatures and pressures continue to rise. If the temperature becomes hot enough the metamorphic rock undergoes melting. The molten rock is called magma.

What determines magma viscosity?

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 is the main factor that determines how volcanoes erupt?

The style of eruption depends on a number of factors including the magma chemistry and content temperature viscosity (how runny the magma is) volume and how much water and gas is in it the presence of groundwater and the plumbing of the volcano.

What characteristics of magma determines its explosiveness?

Viscosity together with the amount of gas dissolved in magma can determine the explosivity of the eruption. More viscous magma with volatiles is more explosive than less viscous magma where gases can bubble out relatively easily.

What will you use to determine the distance the waves have traveled from the origin to that station?

The S – P time interval will then be used to determine the distance the waves have traveled from the origin to that station. The actual location of the earthquake’s epicenter will be on the perimeter of a circle drawn around the recording station.

Why is it important to determine the epicenter?

The main importance in determining the epicentre is so that the fault that ruptured causing the earthquake can be identified. … If the fault is previously unknown (such as the 2010 Canterbury earthquake) then it is important because it means that the hazard models for the area need improvement.

How do scientists determine where an earthquake starts?

Scientists then use a method called triangulation to determine exactly where the earthquake was (see image below). … If you draw a circle on a map around three different seismographs where the radius of each is the distance from that station to the earthquake the intersection of those three circles is the epicenter!

How are earthquakes generated?

An earthquake is caused by a sudden slip on a fault. … When the stress on the edge overcomes the friction there is an earthquake that releases energy in waves that travel through the earth’s crust and cause the shaking that we feel. In California there are two plates – the Pacific Plate and the North American Plate.

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How do faults generate earthquakes?

Faults are blocks of earth’s crust that meet together. … Earthquakes occur when rock shifts or slips along fault lines Earthquakes generate waves that travel through the earth’s surface. These waves are what is felt and cause damage around the epicenter of the earthquake.

What factors affect the earthquake and volcanic activity distribution in the lithosphere?

The factors that affect the distribution of earthquakes and volcanic activities are plate boundaries presence of active volcanoes and the place is along a fault line.

Which component of magma is the highest in value?

Explanation: The silica content in felsic magma is the greatest of all magma forms ranging from 65 to 70%. As a result felsic magma has the highest gas content and viscosity as well as the lowest mean temperatures ranging from 650 to 800 degrees Celsius (1202o and 1472o Fahrenheit).

How does composition affect the viscosity of magma?

Magmas differ in composition which affects viscosity. Magma composition has a large effect on how a volcano erupts. Felsic lavas are more viscous and erupt explosively or do not erupt. Mafic lavas are less viscous and erupt effusively.

What happens to the composition of magma as it rises up?

The higher the amount of silica in the magma the higher is its viscosity. … Most felsic magma will stay deeper in the crust and will cool to form igneous intrusive rocks such as granite and granodiorite. If felsic magma rises into a magma chamber it may be too viscous to move and so it gets stuck.

What is magma made from?

Magma is a molten and semi-molten rock mixture found under the surface of the Earth. This mixture is usually made up of four parts: a hot liquid base called the melt minerals crystallized by the melt solid rocks incorporated into the melt from the surrounding confines and dissolved gases.

Which component of magma is the highest and the lowest in value Brainly?

Felsic magma has the highest silica content of all magma types between 65-70%. As a result felsic magma also has the highest gas content and viscosity and lowest mean temperatures between 650o and 800o Celsius (1202o and 1472o Fahrenheit).

How magma is being formed?

Magma forms from partial melting of mantle rocks. As the rocks move upward (or have water added to them) they start to melt a little bit. … Eventually the pressure from these bubbles is stronger than the surrounding solid rock and this surrounding rock fractures allowing the magma to get to the surface.

Which is likely to have highest viscosity in the composition of magma?

The magma that has the highest viscosity is rhyolitic magma.

What are the three factors that affect the viscosity of magma?

The three factors that influence the viscosity of a lava are temperature the dissolved gases it contains and its chemical composition.

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.

What determines how strong a volcanic eruption will be?

Although there are several factors triggering a volcanic eruption three predominate: the buoyancy of the magma the pressure from the exsolved gases in the magma and the injection of a new batch of magma into an already filled magma chamber.

What provides the force that causes magma to erupt to the surface?

Ch. 15 Review Volcanoes
Question Answer
What provides the force that causes magma to erupt to the surface? dissolved gases trapped in the magma
When magma hardens in a volcano’s pipe the result will eventually be a landform called a volcanic neck
Magma that forces across rock layer hardens into a dike

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What determines the type of volcano that forms?

When magma erupts at the surface as lava it can form different types of volcano depending on: … the amount of gas in the magma. the composition of the magma. the way in which the magma reached the surface.

Which of the following characteristic of magma affect the explosiveness of volcanic eruption?

More crystals in the magma enable more gas bubbles to form and so they make an eruption more explosive. The rate at which pressure is reduced also affects the explosiveness. If magma moves slowly toward the surface gases in the magma have more time to escape.

What type of volcanic eruption is the most explosive?

Plinian eruptions

Pelean and Plinian eruptions are the most dangerous and explosive of the eruption types. Pelean eruptions are named for the catastophic eruption on the island of Martinique in the Carribean Sea in 1902. The eruption and the pyroclastic flow that followed killed 29 000 people almost instantly.

Magma Viscosity Gas Content & Milkshakes

Magma Viscosity

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