Why Are Some Volcanoes More Explosive Than Others


Why Are Some Volcanoes More Explosive Than Others?

Some volcanic eruptions are more dangerous than others says Dr. … Molten rock or magma comes under pressure but it’s how that pressure is released that determines whether the volcano will create a violent sudden eruption or not she says. “If the magma is very sticky very viscus it will explode.Oct 2 2014

Why are some volcanoes more explosive?

The magma isn’t very liquid-y so it is able to trap gases in the depths allowing the pressure inside the volcano to build. When these volcanoes erupt they explode with a bang. The more explosive volcanoes are kind of like soda bottles with lots of trapped gas.

Why are some volcanoes more explosive than others quizlet?

Because basaltic lavas are less viscous they produce relatively gentle eruptions while volcanoes that erupt felsic lavas ( rhyolite and andesite) tend to be more explosive. Composite volcanoes are made up of alternating layers of lava and ash (other volcanoes just consist of lava).

Which type of volcanoes are most explosive and why?

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.

Why do some volcanoes erupt violently while others erupt quietly?

Volcanoes erupt explosively or quietly depending on the characteristics of the magma. Magma can vary in viscosity the resistance to flow. Magma with high viscosity is thick and resists flowing. Magma with low viscosity is thin and flows easily.

Which volcano is most likely to be explosive?

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.

Why do some volcanic eruptions consist mostly of lava flows whereas others are explosive and do not produce lava flows?

Why do some volcanic eruptions consist mostly of lava flows while others are explosive and do not produce flows? Because of its viscosity. If it has high viscosity (felsic) then gas and volatiles cannot escape easily and pressure is built up causing an explosive eruption.

What makes an eruption more explosive quizlet?

Why might water make an eruption more explosive? Hot magma beneath the surface mixes with water. This forms gases. The gas pressure grows until it must be released. The volcano erupts in a large explosion.

What causes volcanic explosiveness quizlet?

Silica-rich magma is stiff and hardens in a volcano’s vent and plugs the vent. As more magma pushes up pressure increases causing an explosive eruption.

Was Mt Everest a volcano?

Mount Everest is not an active volcano. It is not a volcano but a folded mountain formed at the point of contact between the Indian and Eurasian…

Why are Andean volcanoes more explosive than Hawaiian volcanoes?

Lavas and pyroclastics are usually andesitic to rhyolitic in composition. Due to the higher viscosity of magmas erupted from these volcanoes they are usually more explosive than shield volcanoes.

Which volcano is the least explosive?

Shield volcanoes

Shield volcanoes tend to be the least explosive volcanoes. Most of the material they produce is lava rather than the more explosive pyroclastic material.

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What determines if a volcano is quiet or explosive?

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

Would quiet eruptions or explosive?

Would quiet eruptions or explosive eruptions be more likely to increase the height of a volcano? Why? Quiet eruptions because they usually build up layers of lava whereas explosive eruptions often blow up the top of a volcano decreasing its height.

How can you differentiate quiet and explosive eruptions?

Outside of the kitchen this means that the primary product of quiet eruptions is runny lava while the most explosive eruptions spew forth not only thicker lava but also rock fragments and noxious gases which can pummel down the sides of the volcano at speeds of nearly 100 kilometers per hour (about 60 miles per …

What’s the deadliest volcano in the world?

Which volcanic eruptions were the deadliest?
Eruption Year Casualties
Mount St. Helens Washington 1980 573
Kilauea Hawaii 1924 11
Lassen Peak California 1915 4
Mount Vesuvius Italy 79 A.D. 3 3602

Can Mt Fuji erupt?

Sixteen eruptions of New Fuji have been recorded since 781. Many of the eruptions occurred in the Heian era with twelve eruptions between 800 and 1083. … At present there have been no eruptions since the Hoei eruption in 1707–1708 around 300 years ago.

Which of the following materials from volcano determines its explosiveness?

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.

Will Mount Shasta erupt again?

USGS scientists are currently working on this question. Mount Shasta doesn’t erupt on a regular timescale. Research indicates that the volcano erupts episodically with ten or more eruptions occurring in short (500-2 000 year) time periods separated by long intervals (3 000-5 000 years) with few or no eruptions.

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Are composite volcanoes explosive or effusive?

Composite volcanoes are tall steep cones that produce explosive eruptions. Shield volcanoes form very large gently sloped mounds from effusive eruptions.

What is produced during a non explosive eruption?

Nonexplosive eruptions are the most common type of volcanic eruptions. These eruptions produce relatively calm flows of lava in huge amounts. … Vast areas of the Earth’s surface including much of the sea floor and the Northwestern United States are covered with lava form nonexplosive eruptions.

What type of lava is likely to erupt with massive explosions?

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).

Why is a volcano considered a natural disaster?

Volcanic eruptions may be subtle or explosive and can produce dangerous lava flows poisonous gases and flying rocks and ash. Many volcanic eruptions are also accompanied by other natural hazards such as earthquakes landslides debris flows flash floods fires and tsunamis.

What are three names for non explosive lava?

Non-explosive type eruptions mostly produce various types of lava such as a’a pāhoehoe and pillow lavas. Some signs that a volcano may soon erupt include earthquakes surface bulging gases emitted as well as other changes that can be monitored by scientists.

Which composition would be most likely to result in an explosive eruption?

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

When a volcano erupts particles of rock and ash?

When a volcano erupts particles of rock and ash are released into the atmosphere. After this water droplets form around the rock and ash particles and fall to Earth as rain. The rainwater helps plants grow.

How many dead bodies are on Mount Everest?


There have been over 200 climbing deaths on Mount Everest. Many of the bodies remain to serve as a grave reminder for those who follow. PRAKASH MATHEMA / Stringer / Getty ImagesThe general view of the Mount Everest range from Tengboche some 300 kilometers north-east of Kathmandu.

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Is Mount Everest littered with dead bodies?

There are quite a few dead bodies in various places along the normal Everest routes. Some have been there for years some appear only after weather changes and snow deposits moves. Some bodies may only be days old. … This area above 8 000 meters is called the Death Zone and is also known as Everest’s Graveyard.

Can a plane fly over Mount Everest?

Tim Morgan a commercial pilot writing for Quora says aircraft can fly above 40 000 feet and hence it is possible to fly over Mount Everest which stands at 29 031.69 feet. However typical flight routes do not travel above Mount Everest as the mountains create unforgiving weather.

Why are composite volcanoes so explosive?

Composite volcanoes are made of felsic to intermediate rock. The viscosity of the lava means that eruptions at these volcanoes are often explosive (Figure below). … The viscous lava cannot travel far down the sides of the volcano before it solidifies which creates the steep slopes of a composite volcano.

What happens if Mt Hood erupted?

A significant eruption of Mount Hood such as an eruption of lava domes that collapse to form pyroclastic flows and lahars would displace several thousand residents and cause billion-dollar-scale damage to infrastructure and buildings.

Where are the most explosive volcanoes on Earth?

There isn’t much in Kamchatka a remote peninsula in northeastern Russia just across the Bering Sea from Alaska besides an impressive population of brown bears and the most explosive volcano in the world. Kamchatka’s Shiveluch volcano has had more than 40 violent eruptions over the last 10 000 years.

What is an extinct volcano?

A volcano which has not erupted in the past 10 000 years is often listed as extinct. The extinct volcano no longer has a lava supply. An extinct volcano is no longer near an active geologic hot spot if it ever was. … Dormant volcanos may still erupt whereas extinct ones cannot or still may have one percent chance.

Why do some volcanoes ooze lava slowly and others explode?

If there are smaller vents along the volcano then the magma can ooze out slowly through these vents. … If the magma chamber lid is no longer able to contain the pressure it caves in and the trapped gaseous pressure shoots up taking the magma with it which causes an explosion.

Why are some volcanoes more explosive than others?

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