Contrast the viscosity of magma in quiet and explosive eruptions?

1. What is the difference between the viscosity of magma in quiet and explosive eruptions?
2. What is the difference between quiet and explosive eruptions?
3. Do quiet eruptions have high viscosity?
4. Do explosive volcanoes have high viscosity?
5. What type of magma causes explosive eruptions?
6. How does magma influences the explosiveness of an eruption?
7. What type of magma causes quiet volcanoes?
8. What volcanic hazard is involved in both explosive and quiet eruptions?
9. What magma types produce explosive and effusive eruptions?
10. What is viscosity of magma?
11. What characteristics of magma determines its explosiveness?
12. How does viscosity affect the explosiveness of a volcano?
13. Which magma has the highest viscosity?
14. How viscosity affect the movement of magma?
15. When magma has a high viscosity How is it most likely to erupt?

What is the difference between the viscosity of magma in quiet and explosive eruptions?

The gases expand and form bubbles, that will make it to the top. Contrast the silica content of magma in quiet and explosive eruptions. Magma in quiet eruptions has low silica content, while in explosive eruptions, it has high silica content. ... It is low viscosity, and the gasses bubble out gently.

What is the difference between quiet and explosive eruptions?

The difference between a quiet and explosive eruption is the silica content. In a quiet eruption, the magma is low in silica, allowing the magma to flow out gently. In an explosive eruption, the magma is high in silica, which causes the magma to be thick and sticky.

Do quiet eruptions have high viscosity?

Volcanoes that have very hot, low-silica magma generally erupt quietly. In a quiet eruption, lava erupts in a stream of low-viscosity lava, called a lava flow. Lava flows from a quiet eruption can travel for great distances.

Do explosive volcanoes have high viscosity?

Whereas basaltic magmas have higher Fe, Mg, and Ca and lower SiO2, Al, and Na. Also of note, is the total amount of dissolved gasses that are trapped within the magma. ... This gas content and relative viscosity leads to the more explosive and violent eruptions that occur at composite volcanoes.

What type of magma causes explosive eruptions?

Explosive eruptions are favored by high gas content & high viscosity magmas (andesitic to rhyolitic magmas).

How does magma influences 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.

What type of magma causes quiet volcanoes?

1. Low-silica magma, called basaltic, is fluid and produces a quiet, nonexplosive eruption.

What volcanic hazard is involved in both explosive and quiet eruptions?

They can occur both during an eruption and when a volcano is quiet. The water that creates lahars can come from melting snow and ice (especially water from a glacier melted by a pyroclastic flow or surge), intense rainfall, or the breakout of a summit crater lake.

What magma types produce explosive and effusive eruptions?

Lesson Summary. The style of a volcanic eruption depends on magma viscosity. Felsic magmas produce explosive eruptions. Mafic magmas produce effusive eruptions.

What is viscosity of magma?

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 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.

How does viscosity affect the explosiveness of a volcano?

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.

Which magma has the highest viscosity?

The magma that has the highest viscosity is rhyolitic magma.

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.

When magma has a high viscosity How is it most likely to erupt?

A high viscosity magma will flow more readily and easily than a low viscosity magma. Therefore the eruption will be fluid and passive. A high viscosity magma will flow more readily and easily than a low viscosity magma. Therefore the eruption will be explosive.