What Primary Factors Determine The Nature Of Volcanic Eruptions?

What Primary Factors Determine The Nature Of Volcanic Eruptions??

The primary factors that determine the nature of volcanic eruptions include the magma’s temperature its composition and the amount of dissolved gases it contains. As lava cools it begins to congeal and as viscosity increases its mobility decreases. The viscosity of magma is directly related to its silica content.

What primary factors determine the nature of volcanic eruptions quizlet?

what are the primary factors that determine the nature of volcanic eruptions? The magma’s composition it’s temperature and the amount of dissolved gases it contains.

What are the two main factors that determine the type of volcanic eruption?

The two main factors that influence how a volcano will erupt are viscosity and gas content. Both are related to the composition of the magma.

What are the 3 primary factors affecting the volcanoes eruptive style?

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 determines a volcanic eruption?

The explosivity of an eruption depends on the composition of the magma. If magma is thin and runny gases can escape easily from it. When this type of magma erupts it flows out of the volcano. A good example is the eruptions at Hawaii’s volcanoes.

What are the two primary factors that determine how magma erupts quizlet?

The two primary factors that determine how magma erupts is its viscosity and gas content.

What factors determine the type of magma found in a volcano?

Different minerals within a rocks melt at different temperatures and the amount of partial melting and the composition of the original rock determine the composition of the magma. Magma collects in magma chambers in the crust at 160 kilometers (100 miles) beneath the surface of a volcano.

What are effusive and explosive eruptions What are the two primary factors that determine the nature of a volcanic eruption?

The style of a volcanic eruption depends on magma viscosity. Felsic magmas produce explosive eruptions. Mafic magmas produce effusive eruptions. Explosive eruptions happen along the edges of continents and produce tremendous amounts of material ejected into the air.

What causes a volcanic eruption to be 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 causes volcanic eruptions tectonic plates?

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 primary factors determine the nature of volcanic eruptions How do these factors affect a magma’s viscosity?

Viscosity of Magmas

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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 are the 3 factors that affect the nature of an eruption?

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 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.

What are the causes of volcanic eruption Wikipedia?

Volcanic eruptions arise through three main mechanisms:
  • Gas release under decompression causing magmatic eruptions.
  • Thermal contraction from chilling on contact with water causing phreatomagmatic eruptions.
  • Ejection of entrained particles during steam eruptions causing phreatic eruptions.

What factors increase the explosive potential of magma during a volcanic eruption?

Temperature of magma amount of dissolved gas in High viscosity and dissolved gas increase the explosive potential of a magma.

Which of the following is primarily responsible for explosive volcanic eruptions?

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 type of volcanic material is indicative of eruption under water?

Lava flows produced by eruptions under water are called pillow lavas. If the viscosity is high but the gas content is low then the lava will pile up over the vent to produce a lava dome or volcanic dome.

What factors determine whether a volcanic eruption will be violent or relatively quiet?

The amount of water vapor and other gases present is one factor that determines whether a volcanic eruption will be quiet or explosive.

How magma composition affects the eruption of a volcano?

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 are the three major factors controlling the viscosity of magma lava?

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

What are the two important factors determine whether an eruption will be explosive or quiet?

Volcanoes
Question Answer
These two factors control whether an eruption will be explosive or quiet? Water vapor and silica
Magma that is low in silica and produces nonexplosive eruptions is called? basaltic
Magma that is high in silica and produces explosive eruptions is called? granitic

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What is the difference between effusive volcanic eruption and explosive volcanic eruption?

If lava is flowing out of the volcano we would call this an effusive eruption. On the other hand when gas and broken fragments are shot up into the atmosphere the magma has literally exploded before falling back to Earth. If the magma has been blown to pieces we would call this an explosive eruption.

What are two key components controlling the explosive nature of a volcano?

Foremost of these are magma viscosity gas loss and external properties such as conduit geometry. Ultimately these parameters control the speed at which magmas ascend decompress and outgas en route to the surface and thus determine eruptive style and evolution.

In what tectonic environment do volcanic eruptions usually occur?

Volcanism occurs at convergent boundaries (subduction zones) and at divergent boundaries (mid-ocean ridges continental rifts) but not commonly at transform boundaries.

What is the primary cause of volcanoes and earthquakes?

BACKGROUND: Most earthquakes and volcanoes occur because of the movement of the plates especially as plates interact at their edges or boundaries. At diverging plate boundaries earthquakes occur as the plates pull away from each other. … First both volcanoes and earthquakes form where one plate sinks under the other.

What are the causes of volcanoes?

Volcanoes happen when magma rises to the surface of the earth which causes bubbles of gas to appear in it. This gas can cause pressure to build up in the mountain and it eventually explodes. When the magma bursts out of the earth it is called lava.

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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.

What is the primary factor in determining the viscosity of volcanoes?

There are three main factors that determine the viscosity of magma: temperature water content and silica content. Higher temperatures lower the viscosity of magma so it flows more easily. Water in magma helps it flow more easily. Magma that is high in silica has high viscosity.

What two factors control the explosiveness of an eruption quizlet?

What two factors control the explosiveness of an eruption? The amount of water vapor and silica in the magma.

What are the 5 types of volcanic eruptions?

Volcanic eruptions may fall into six major types: Icelandic Hawaiian Strombolian Vulcanian Pelean and Plinian.

How do the three main types of volcanoes differ?

Size Differences

Cinder cone volcanoes are relatively small rarely exceeding 1 000 feet tall. Composite volcanoes also known as stratovolcanoes are towering structures often rising more than 10 000 feet. Shield volcanoes are broad typically 20 times wider than they are high. These volcanoes can be massive.

What are the three main type of volcanoes?

There are three types of volcanoes: cinder cones (also called spatter cones) composite volcanoes (also called stratovolcanoes) and shield volcanoes. Figure 11.22 illustrates the size and shape differences amongst these volcanoes. Shield volcanoes which get their name from their broad rounded shape are the largest.

Where do volcanic eruptions generally occur give one example?

Answer: Sixty percent of all active volcanoes occur at the boundaries between tectonic plates. Most volcanoes are found along a belt called the “Ring of Fire” that encircles the Pacific Ocean. Some volcanoes like those that form the Hawaiian Islands occur in the interior of plates at areas called “hot spots..

Are all volcanic eruptions the same?

No the same volcano can produce different magmas at different times and sometimes even in the same eruption. It depends on what has melted to form the magma in the magma chamber and what this magma has mixed with on its way to the surface. … There are two types of igneous rock volcanic and plutonic.

Volcanic eruption explained – Steven Anderson

Volcanoes 101 | National Geographic

Factors Affecting Volcanic Eruptions

Volcanic Debris of Fokutoku-Okanoba Eruption Covered The Shores of Batanes @Getty Images TV

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