What primary factors determine the nature of volcanic eruptions choose all that apply?
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 How do these factors affect a magma’s viscosity?
What are the two primary factors that determine how magma erupts? The viscosity and gas content of a magma determines how it erupts. Low viscosity and low gas content generally lead to quiescent eruptions.
What are the primary factors that determine whether a volcano erupts explosively or?
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.
What are the two primary factors that determine how magma erupts?
The two primary factors that determine how magma erupts is its viscosity and gas content.
What causes volcanic eruptions?
The melted rock, or magma, is lighter than the surrounding rock and rises up. This magma collects in magma chambers, but it is still miles below the surface. When enough magma builds up in the magma chamber, it forces its way up to the surface and erupts, often causing volcanic eruptions.
Which of the following are the primary gases that erupt from volcanoes?
Ninety-nine percent of the gas molecules emitted during a volcanic eruption are water vapor (H2O), carbon dioxide (CO2), and sulfur dioxide (SO2). The remaining one percent is comprised of small amounts of hydrogen sulfide, carbon monoxide, hydrogen chloride, hydrogen fluoride, and other minor gas species.
Which of the following factors help 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.
Which of the following factors help determine whether a volcanic eruption will be violent or relatively quiescent?
Which of the following factors help determine whether a volcanic eruption will be violent or relatively quiescent? It is determined by the primary factors of the magma's Temperature, its Composition, and the amount of Dissolved Gases it contains. The viscosities of magmas increase with increasing percentages of silica.
What are the 3 main causes of 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 causes a volcanic eruption Wikipedia?
A volcanic eruption occurs when hot materials from the Earth's interior are thrown out of a volcano. Lava, rocks, dust, and gas compounds are some of these "ejecta".
What are the causes and effects of volcanic eruption?
Volcanoes spew hot, dangerous gases, ash, lava, and rock that are powerfully destructive. People have died from volcanic blasts. Volcanic eruptions can result in additional threats to health, such as floods, mudslides, power outages, drinking water contamination, and wildfires.
What are the main gases released during a volcanic eruption and what role do gases play in eruptions?
What role do gases play in eruptions? Water vapor, carbon dioxide, nitrogen, and sulfur dioxide. These gases escape as the confining pressure over a magma is released, releasing the gases into the atmosphere.
Which of the following is a major factor in determining whether a volcanic eruption will be violent explosive or relatively quiescent effusive )?
Volcanic eruptions can be explosive, sending ash, gas and lava high up into the atmosphere, or the magma can form lava flows, known as effusive eruptions. Whether an eruption is explosive or effusive largely depends upon the amount of gas in the magma.
What are 2 important factors that affect the explosiveness of a volcanic eruption?
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.
Which of the following factors causes an explosive eruption from a composite volcano?
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 are signs that a volcano is about to erupt?
How can we tell when a volcano will erupt?
- An increase in the frequency and intensity of felt earthquakes.
- Noticeable steaming or fumarolic activity and new or enlarged areas of hot ground.
- Subtle swelling of the ground surface.
- Small changes in heat flow.
- Changes in the composition or relative abundances of fumarolic gases.
What is the main cause of earthquakes and volcanic eruptions?
Both volcanoes and earthquakes occur due to movement of the Earth's tectonic plates. They are both caused by the heat and energy releasing from the Earth's core. Earthquakes can trigger volcanic eruptions through severe movement of tectonic plates.
What are the causes of volcanic eruption Wikipedia?
Volcanic eruptions arise through three main mechanisms:
- Gas release under decompression, causing magmatic eruptions.
- Ejection of entrained particles during steam eruptions, causing phreatic eruptions.
- Thermal contraction from chilling on contact with water, causing phreatomagmatic eruptions.
Which of the following is used to determine volcanic activity?
Scientists use a wide variety of techniques to monitor volcanoes, including seismographic detection of the earthquakes and tremor that almost always precede eruptions, precise measurements of ground deformation that often accompanies the rise of magma, changes in volcanic gas emissions, and changes in gravity and …
What are the primary and secondary effects of volcanic eruptions?
VOLCANIC HAZARDS 3 Primary hazards are direct hazards from eruption such as pyroclastic flows, pyroclastic falls, lava flows and poisonous gas release. The secondary hazards are the indirect consequences such as lahars, tsunamis and epidemic disease and post-eruption famine.
What are the 3 main effects of volcanic eruptions?
Volcanoes spew hot, dangerous gases, ash, lava, and rock that are powerfully destructive. People have died from volcanic blasts. Volcanic eruptions can result in additional threats to health, such as floods, mudslides, power outages, drinking water contamination, and wildfires.
Which of the following factors associated with huge volcanic eruptions may cause the decrease in the earths average temperature for a few years?
Large eruption columns inject ash particles and sulfur-rich gases into the troposphere and stratosphere and these clouds can circle the globe within weeks of the volcanic activity. The small ash particles decrease the amount of sunlight reaching the surface of the earth and lower average global temperatures.
Which of the following factors helps determine whether a volcanic eruption will be violent or relatively quiescent?
Which of the following factors help determine whether a volcanic eruption will be violent or relatively quiescent? It is determined by the primary factors of the magma's Temperature, its Composition, and the amount of Dissolved Gases it contains. The viscosities of magmas increase with increasing percentages of silica.
Which of the following factors helps determine whether a volcanic eruption will be explosive or relatively quiet?
A. The amount of water vapor and other gases present is one factor that determines whether a volcanic eruption will be quiet or explosive.
What two factors seem to be the most important in the formation of an explosive eruption?
Two important factors control whether an eruption will be explosive or quiet. One factor is the amount of water vapor and other gases that are trapped in the magma. The second factor is how much silica is present in the magma.
What causes volcanic eruption?
The melted rock, or magma, is lighter than the surrounding rock and rises up. This magma collects in magma chambers, but it is still miles below the surface. 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 causes of volcanoes?
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 this happens, the ocean plate sinks into the mantle.
What is the primary cause of volcanoes and earthquake?
Both volcanoes and earthquakes occur due to movement of the Earth's tectonic plates. They are both caused by the heat and energy releasing from the Earth's core. Earthquakes can trigger volcanic eruptions through severe movement of tectonic plates.
What is the reason for the volcanic eruption?
Deep within the Earth it is so hot that some rocks slowly melt and become a thick flowing substance called magma. 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.
How do we predict volcanic eruptions?
Although volcanoes commonly provide several kinds of warnings before erupting, there is no single warning signal that allows volcanologists to accurately predict every eruption. Instead, data from various types of monitoring instruments are combined to help scientists forecast eruptions at least a few days in advance.