What are the three factors that influence viscosity of a lava

Temperature, composition, and volatile (gas) content largely determine the viscosity of lava.

What are the 3 factors affecting 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 are 3 factors that affect lava flow?

The speed at which lava moves across the ground depends on several factors, including (1) type of lava erupted and its viscosity; (2) steepness of the ground over which it travels; (3) whether the lava flows as a broad sheet, through a confined channel, or down a lava tube; and (4) rate of lava production at the vent.

What are the three factors that influence viscosity of a lava quizlet?

Three factors that affect magma viscosity are temperature, composition, and presence of dissolved gases.

What three factors determine the viscosity of a liquid?

ADVERTISEMENTS: The viscosity of liquids generally depends upon the size, shape and chemical nature of their molecules. It is greater with larger than with smaller molecules; with elongated than with spherical molecules. Large amounts of dissolved solids generally increase viscosity.

How viscosity affect the movement of magma?

Heating reduces viscosity (warm syrup flows more easily than cold.) High viscosity lavas flow slowly and typically cover small areas. In contrast, low viscosity magmas flow more rapidly and form lava flows that cover thousands of square kilometers.

What is the viscosity of a lava?

Viscosity of Magmas 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.

What are the 3 types of volcanoes describe the differences between each type?

There are three main types of volcano – composite or strato, shield and dome. Composite volcanoes, sometimes known as strato volcanoes, are steep sided cones formed from layers of ash and [lava] flows. … When composite volcanoes erupt they are explosive and pose a threat to nearby life and property.

What are the three components of lava?

Element (Symbol)Weight percentOxygen (O)46.6Sodium (Na)2.8Potassium (K)2.6Magnesium (Mg)2.1

What two principal factors affect the viscosity of magma lava?

The viscosity of magma depends upon its silica content and temperature.

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What determines the viscosity of lava?

Viscosity of Magmas 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 factors effect viscosity?

One can imagine the strength with which the molecules cling together, which will be proportional to the friction. This strength is known as viscosity. Viscosity determines the friction amount, which determines the amount of energy absorbed by the flow.

How does the viscosity of a lava affect the steepness of a volcano slope?

These volcanoes produce sticky, higher viscosity magma (andesite and rhyolite) that does not travel very far. When layered between ash, this magma will pile up into much steeper sided, conical shaped volcanoes – much like you would imagine a volcano to look like.

What are the three tectonic settings where magma is formed?

As summarized in Chapter 3, magma is formed at three main plate-tectonic settings: divergent boundaries (decompression melting), convergent boundaries (flux melting), and mantle plumes (decompression melting).

What are the factor that contribute to magma formation?

The main factors involved in the formation of magma are temperature, pressure, water content, and mineral composition.

What made the magma more viscous?

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. … More viscous magma with volatiles is more explosive than less viscous magma, where gases can bubble out relatively easily.

What elements are in lava?

Lava is mostly made of two elements — Si (the symbol for silicon) and O (the symbol for oxygen). Together, they make a very strong bond and then get together with other elements, like Fe (iron), Mg (magnesium), K (potassium), Ca (calcium), and more.

What creates lava?

Lava forms when magma erupts from a volcano. As pressure is released gases, dissolved in the magma, bubble out so the composition of lava changes. Most lava flows are formed by the eruption of hot (around 1200oC) basalt magma, (see video clip above).

What elements are in Hawaiian lava?

The high fluidity (low viscosity) of Hawaiian lavas derives mainly from its basaltic composition, characterized by more iron (Fe), magnesium (Mg), calcium (Ca), and titanium (Ti), and less silicon (Si), aluminum (Al), sodium (Na), and potassium (K), compared to such viscous lavas as the dacite erupted explosively at …

What are the 3 types of magma that commonly form volcanoes?

There are three basic types of magma: basaltic, andesitic, and rhyolitic, each of which has a different mineral composition.

What are the three classification of volcanoes?

Volcanoes are classified as active, dormant, or extinct. Active volcanoes have a recent history of eruptions; they are likely to erupt again.

Which of the three types of volcanoes discussed pose the greatest threat to property and human life?

pyroclastic flows and lahars are most dangerous to human life. Ash fall and lava flows affect property.

What two principal factors affect the viscosity of magma lava which is more viscous basaltic or granitic magma Why?

Magma that produce basaltic rocks contain about 50% silica, whereas granitic magma contain more than 70% silica. … It follows, therefore, that the loss of gases renders magma or lava more viscous.

Which of these factors influence magma chemistry?

The factors that mainly affect in the formation of magma can be summarized into three: Temperature, Pressure and composition.

Which of the factors contributes to a low viscosity of a liquid?

Which of the factors contributes to a low viscosity of a liquid? Viscosity is defined as a liquid’s resistance to flowing, so compounds with weaker intermolecular forces will have lower viscosities.

What are the types of viscosity?

• Dynamic (absolute) viscosity – the measurement of the fluid’s internal resistance to flow when force is applied.
• Kinematic viscosity – refers to the ratio of dynamic viscosity to density, or a measurement of the viscosity of a fluid in motion.

What is viscosity explain the cause of 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.

How does the viscosity of lava affect the formation of rocks?

The higher the amount of silica in the magma, the higher is its viscosity. Viscosity is a liquid’s resistance to flow. … 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 are the three types of tephra?

• Ash – particles smaller than 2 mm (0.08 inches) in diameter.
• Lapilli or volcanic cinders – between 2 and 64 mm (0.08 and 2.5 inches) in diameter.
• Volcanic bombs or volcanic blocks – larger than 64 mm (2.5 inches) in diameter.

How does magma influence the explosiveness of an 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. … The speed at which gases are released from magma is also affected by the amount of small crystals in it, where gas bubbles begin to form.