Highly Explosive Volcanoes Tend To Have What Type Of Magma?

Highly Explosive Volcanoes Tend To Have What Type Of Magma??

Explosive eruptions are favored by high gas content & high viscosity magmas (andesitic to rhyolitic magmas).Aug 26 2017

What is the highly explosive magma?

Basaltic eruptions are the most common form of volcanism on Earth and planetary bodies. The low viscosity of basaltic magmas inhibits fragmentation which favours effusive and lava-fountaining activity yet highly explosive hazardous basaltic eruptions occur.

What makes magma more explosive?

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 magma is the most violent?

Not surprisingly supervolcanoes are the most dangerous type of volcano. Supervolcanoes are a fairly new idea in volcanology. The exact cause of supervolcano eruptions is still debated however scientists think that a very large magma chamber erupts entirely in one catastrophic explosion.

What type of eruption is the most explosive?

Plinian eruption

A Plinian eruption is the most explosive of the eruption types. Mt. St. Helens eruption was a plinian eruption.

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Which type of volcanic eruption is very explosive?

A Pelean eruption is associated with explosive outbursts that generate pyroclastic flows dense mixtures of hot volcanic fragments and gas described in the section Lava gas and other hazards. Pelean eruptions are named for the destructive eruption of Mount Pelée on the Caribbean island of Martinique in 1902.

What makes a volcanic eruption explosive?

A volcano’s explosiveness depends on the composition of the magma (molten rock) and how readily gas can escape from it. As magma rises and pressure is released gas bubbles (mainly of water vapor and carbon dioxide) form and expand rapidly causing explosions.

What determines the explosiveness of a volcano?

The amount of dissolved gas in the magma provides the driving force for explosive eruptions. The viscosity of the magma however is also an important factor in determining whether an eruption will be explosive or nonexplosive.

Which characteristic 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 kind of volcanic eruption is least explosive?

Shield volcanoes

Shield volcanoes tend to be the least explosive volcanoes.

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Which type of magma will produce the least explosive volcanic eruption quizlet?

A more viscous (thick) magma will produce a more violent eruption This is controlled in part by the concentration of silica in the magma. A magma with low silica (<45%) will be runny and so the eruption will not be explosive.

What are the types of volcanic eruption?

Types of eruptions
  • Hydrothermal eruption. An eruption driven by the heat in a hydrothermal systems. …
  • Phreatic eruption. An eruption driven by the heat from magma interacting with water. …
  • Phreatomagmatic eruption. …
  • Lava. …
  • Strombolian and Hawaiian eruptions. …
  • Vulcanian eruptions. …
  • Subplinian and Plinian eruptions.

What kind of magma produces violent eruptions?

Explosive eruptions are favored by high gas content & high viscosity magmas (andesitic to rhyolitic magmas). The explosive bursting of bubbles fragments the magma into clots of liquid that cool as they fall through the air.

Which is the most explosive type of volcanic eruption Why?

Plinian Eruption

The largest and most violent of all the types of volcanic eruptions are Plinian eruptions. They are caused by the fragmentation of gassy magma and are usually associated with very viscous magmas (dacite and rhyolite).

What type of magma does composite volcanoes have?

Andesitic magma

Composite volcanoes have the following characteristics: Andesitic magma which is lower in temperature has more silica and a lot of dissolved gases and is more likely to explode when it reaches the surface. Acidic lava which is very viscous (sticky). Steep sides as the lava doesn’t flow very far before it solidifies.

What happens to magma during volcanic eruption?

Since it is lighter than the solid rock around it magma rises and collects in magma chambers. Eventually some of the magma pushes through vents and fissures to the Earth’s surface. … If magma is thin and runny gases can escape easily from it. When this type of magma erupts it flows out of the volcano.

How does lava explode?

As the magma rises bubbles of gas form inside it. Runny magma erupts through openings or vents in the earth’s crust before flowing onto its surface as lava. If magma is thick gas bubbles cannot easily escape and pressure builds up as the magma rises. … this can build up enough pressure to cause an explosion.

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Which type of volcanic eruption involves both magma and water?

Volcanic eruptions vary widely in strength. On the one extreme there are effusive Hawaiian eruptions which are characterized by lava fountains and fluid lava flows which are typically not very dangerous. On the other extreme Plinian eruptions are large violent and highly dangerous explosive events.

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What properties of magma favor an explosive volcanic eruption?

Explosive eruptions are favored by high gas content and high viscosity (andesitic to rhyolitic magmas). Explosive bursting of bubbles will fragment the magma into clots of liquid that will cool as they fall through the air.

What type of eruption is mafic magma?

The adjacent Magma Comparison table summarizes properties of the two basic magma types. Mafic magma produces high volume slow moving effusive eruptions. It forms within the upper mantle much deeper than felsic magma.

Which magma type produces the most lava flows?

fallout of volcanic blocks the size of automobiles. glowing avalanches of volcanic rock fragments. Which magma type produces the most lava flows? Rhyolitic.

What kind of volcano formed from a violent eruption with a narrow base and steep sides?

Stratovolcanoes have relatively steep sides and are more cone-shaped than shield volcanoes. They are formed from viscous sticky lava that does not flow easily. The lava therefore builds up around the vent forming a volcano with steep sides.

What does it mean by higher silica content magma in terms of viscosity?

The higher the amount of silica in the magma the higher is its viscosity. Viscosity is a liquid’s resistance to flow. Viscosity determines what the magma will do. Mafic magma is not viscous and will flow easily to the surface. Felsic magma is viscous and does not flow easily.

Where does magma collect in a volcano?

magma chamber

Magma is hot melted rock found inside the Earth . It collects deep under a volcano in an area called a magma chamber. Over time magma and gases like water vapor and carbon dioxide build up in the magma chamber. When the pressure becomes too great a volcano will erupt.

Which type of volcano is formed from ejected lava fragments?

Cinder cones are the simplest type of volcano. They are built from particles and blobs of congealed lava ejected from a single vent. As the gas-charged lava is blown violently into the air it breaks into small fragments that solidify and fall as cinders around the vent to form a circular or oval cone.

What is a volcanic lava?

Molten rock below the surface of the Earth that rises in volcanic vents is known as magma but after it erupts from a volcano it is called lava. … After cooling liquid magma may form crystals of various minerals until it becomes completely solid and forms an igneous or magmatic rock.

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What are the 4 types of volcanic eruptions?

There are four types of eruptions with properties determined mostly by the silica content of magma and the amount of gas it contains. In order of increasing explosiveness these are Hawai’ian Strombolian Vulcanian and Plinian eruptions.

Which magma would have the highest viscosity and be the most explosive?

rhyolitic magma

The magma that has the highest viscosity is rhyolitic magma. One of the main reasons for the high viscosity in rhyolitic magma is that it contains a…

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What type of magma has the highest silica content quizlet?

RHYOLITIC magma contains more than 65% SILICA and is referred to as FELSIC. ANDESITIC magma is INTERMEDIATE in composition (55-65% SILICA). When these magmas erupt onto earth’s surface each lava type solidifies to produce a different volcanic rock – BASALT ANDESITE and RHYOLITE.

Which type of volcano is the most powerful and explosive?

Stratovolcanoes are considered the most violent. Mount St. Helens in Washington state is a stratovolcano that erupted on May 18 1980.

How magma is 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.

What are types of magma?

The high temperatures and pressure under Earth’s crust keep magma in its fluid state. There are three basic types of magma: basaltic andesitic and rhyolitic each of which has a different mineral composition.

What magma type contains the greatest amount of SiO2?

What magma type contains the greatest amount of SiO2? Rhyolitic Andesitic Basaltic. Rhyolitic contains most SiO2.

Which is the most explosive type of volcanic eruption quizlet?

The largest and most violent of all the types of volcanic eruptions are Plinian eruptions. They are caused by the fragmentation of gassy magma and are usually associated with very viscous magmas (dacite and rhyolite).

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