what conditions make for a violent volcanic eruption

  • 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.

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

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?

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