What Conditions Make For A Violent Volcanic Eruption


What Conditions Make For A Violent Volcanic Eruption?

Relatively thick magma containing significantly high levels of gas cause violent volcanic eruptions. Thick magma (viscous magma) doesn’t flow easily. What makes a magma viscous is high silica content. Rhyolitic (silica-rich and high gas content) magma has a high viscosity and a lot of dissolved gas.Dec 2 2018

What conditions make an apex violent eruption?

The correct answer is: Magma with high viscosity. Question: What conditions make for a violent volcanic eruption? The correct answer is: Magma with high silica content.

What are three factors that determine how violent a volcanic eruption will be?

There are three main factors that influence the violence of a volcanic eruption: 1. magma viscosity 2. magma temperature and 3. amount of dissolved gases.

What happens during an explosive volcanic eruption?

Explosive eruptions occur where cooler more viscous magmas (such as andesite) reach the surface. Dissolved gases cannot escape as easily so pressure may build up until gas explosions blast rock and lava fragments into the air!

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Which of these volcanic eruption types is the most violent?

A Plinian eruption is the most explosive of the eruption types.

Which of these volcanic eruption types is the least violent?

The relative passivity of Strombolian eruptions and its non-damaging nature to its source vent allow Strombolian eruptions to continue unabated for thousands of years and also makes it one of the least dangerous eruptive types.

What factors influence the violence or style of an eruption quizlet?

The violence of an eruption is related to how easily gases escapes from the magma. – Gas cannot escape easily from a viscous magma allowing it to collect. Is silica poor low gas content high melting temperature compared to rhyolitic to andesitic magma.

What causes a volcano to erupt for kids?

Volcanoes erupt when molten rock called magma rises to the surface. … 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.

What is the cause and effect of volcanic eruption?

Effects of volcanic eruptions
Positive Negative
The high level of heat and activity inside the Earth close to a volcano can provide opportunities for generating geothermal energy. Lava flows and lahars can destroy settlements and clear areas of woodland or agriculture.

What is violent volcanic eruption?

In volcanology an explosive eruption is a volcanic eruption of the most violent type. … Such eruptions result when sufficient gas has dissolved under pressure within a viscous magma such that expelled lava violently froths into volcanic ash when pressure is suddenly lowered at the vent.

What factors determine whether an eruption will be explosive?

When the pressure in the bubbles is greater than the pressure of the overlying rock then the chamber will burst causing a volcanic eruption. The viscosity temperature and composition of the magma determine whether the explosion is explosive or effusive.

What type of volcano has violent explosive eruptions?

Composite 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.

What do only the most violent volcanic eruptions feature?

Only the most violent volcanic eruptions feature pyroclastic flow. Pyroclastic flow is a huge fast-moving cloud of extremely hot ash and other…

Why do certain types of volcano erupt less violent than other types of volcanoes?

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.

Which type of eruption is the most destructive least destructive?

What Are the Types of Eruptions From Most to Least Destructive?
  • Plinian Eruptions. Plinian eruptions may go by the name Vesuvian eruptions in some categorization schemes but are categorized separately in others. …
  • Pelean Eruptions. …
  • Vulcanian Eruptions. …
  • Strombolian Eruptions. …
  • Hawaiian Eruption.

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Which factor determines whether a volcano will have an explosive violent eruption quizlet?

A magma with a lot of dissolved gases will form a lot of large bubbles. It is the bursting of these bubbles that causes an eruption to be explosive so the more volatiles in the magma the more violent the eruption.

What two factors contribute to the greater explosiveness of volcanic eruptions?

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 causes volcano?

On land volcanoes form when one tectonic plate moves under another. Usually a thin heavy oceanic plate subducts or moves under a thicker continental plate. … When enough magma builds up in the magma chamber it forces its way up to the surface and erupts often causing volcanic eruptions.

What are the dangers to humans when a volcano erupts?

Major health threats from a volcanic eruption

Health concerns after a volcanic eruption include infectious disease respiratory illness burns injuries from falls and vehicle accidents related to the slippery hazy conditions caused by ash.

How do volcanoes formed what are its two main processes?

Volcanoes are formed when magma from within the Earth’s upper mantle works its way to the surface. At the surface it erupts to form lava flows and ash deposits. Over time as the volcano continues to erupt it will get bigger and bigger.

How does volcanic eruption affect the biotic factors?

Livestock and other mammals have been killed by lava flows pyroclastic flows tephra falls atmospheric effects gases and tsunami. They can also die from famine forest fires and earthquakes caused by or related to eruptions. … Eruptions can influence bird migration roosting flying ability and feeding activity.

What does Black smoke from a volcano mean?

“Black smokers” are chimneys formed from deposits of iron sulfide which is black. “White smokers” are chimneys formed from deposits of barium calcium and silicon which are white. Underwater volcanoes at spreading ridges and convergent plate boundaries produce hot springs known as hydrothermal vents.

What are the secondary effects of a volcanic eruption?

The secondary hazards are the indirect consequences such as lahars tsunamis and epidemic disease and post-eruption famine. During eruptions volcanoes release a huge amount of pyroclastic rocks or tephra into the atmosphere and these clastic deposits will fall back and accumulate on the surrounding Earth’s surface.

Are there violent volcanic eruptions?

The most violent eruption registered in history was that in the La Garita Caldera in the United States. It occurred 2.1 million years ago and formed a 35 x 75 km crater drastically changing the climate on Earth. Fortunately these eruptions are rare: they occur every 50 000 or 100 000 years.

What are the two most violent eruptions?

Which volcanic eruptions were the deadliest?
Eruption Year Major Cause
Krakatau Indonesia 1883 Tsunami2
Tambora Indonesia 1815 Starvation2
Unzendake Japan 1792 Volcano collapse Tsunami2
Lakagigar (Laki) Iceland 1783 Starvation2

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What type of volcano has the most violent 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).

What determines whether a volcano erupts quietly or explosively?

the primary factors that determine whether a volcano erupts explosively or quietly include characteristics of the magma and the amount of dissolved gases in the magma.

What type of volcano has the largest and most violent eruptions?

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

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.

Was Mount Everest a volcano?

Just to put you at ease Everest is not a volcano and will never erupt. Sherpas and climbers will stay in business for a long time. Yet there are a number of super volcanoes on earth building pressure. These eruptions are extremely rare as pressure building isn’t always what triggers a volcano event.

What could be the reasons for these volcanoes to have high eruptive force?

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 follows is a brief description of these processes.

What is a periodic weak to violent eruption characterized by Fountain Lava?

A periodic weak to violent eruption characterized by fountain lava. … A steam-driven eruption as the hot rocks come in contact with water. Phreatomagmatic. Is a violent eruption due to the contact between water and magma.

Why are some volcanoes more damaging than others?

Thick lava for example acid lava has the potential to cause much larger and more explosive eruptions therefore presenting a larger threat and increased potential for hazardous activity. The location of a volcano is also a large variable in determining the nature of its eruptions.

Which of the following factors help determine whether a volcanic eruption will be violent or relatively?

geo quiz 6
Question Answer
The ________ ocean basin is rimmed by the most subduction zones. Pacific
Which of the following factors help determine whether a volcanic eruption will be violent or relatively quiescent? All of these ( amount of dissolved gas in the magma temperature of the magma composition of the magma)

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