- The volume of volcanic products.
- The interval length between eruptions.
- The composition of volcanic products.
- The variety of volcanic eruption types.
- The geometry of the vent.
- The environment into which the volcanic products are erupted.
What is the main factor that determines the type of volcano?
The most important factor in determining the shape or type of volcano is the viscosity of the magma that builds the volcano. Viscosity is a measure of a fluid material’s resistance to flow and results from the internal forces and friction between the material’s molecules.
What are the primary factors that determine whether a volcano erupts explosively or?
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 are the three main factors that determine the shape of a volcano?
The overall size of a volcano is determined by the total volume of lava that has erupted. The shape of a volcano is largely determined by the type of lava that has erupted, and importantly, its viscosity. Viscosity is a fluid’s resistance to flow. Water, for example, is a low viscosity fluid.
What are three factors that determine how violently or quietly a volcano erupts?
The primary factors that determine whether a volcano erupts violently or quietly include magma composition, magma tempera- ture, and the amount of dissolved gases in the magma.
What determines whether a volcanic activity will be lava flow or a pyroclastic eruption?
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 factor best determines what type of volcano will form in a given area quizlet?
Tectonic setting determines the type of volcano. Mid-ocean ridges produce lava plains. Subduction zones produce composite volcanoes. Hot spots beneath oceans produce basaltic shield volcanoes, while hot spots beneath continents produce caldera-forming eruptions and rhyolitic magma.
Which volcanic factor below primarily determines the physical characteristics of a volcano?
The physical properties of its magma determine how a volcano erupts. Whether an eruption is quiet or explosive depends on the magma’s silica content and viscosity.
What are two primary factors that determine how magma erupts?
The two primary factors that determine how magma erupts is its viscosity and gas content.
What are the two primary factors that determine the nature of a volcanic eruption?
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 determines how strong a volcanic eruption will be?
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.
Which of the following will determine the shape of the volcanic cone?
The thickness and thinness of the magma will determine how a volcano will erupt and what kind of a cone will form. 1. The magma deep under the crust is less dense than the surrounding rock causing it to rise. … Volcanoes are classified by the eruption type and by the volcanic cone shape.
What determines the viscosity of magma?
Viscosity of MagmasViscosity 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 causes a volcano to take on a particular shape?
Volcanoes have several shapes, which are controlled by the composition of the magma and the nature of its eruption. If a volcano produces very fluid lava (low in the compound SiO2, or silica), the magma flows a long distance before it cools, making a flat, shield-shaped volcano.
What causes quiet and explosive eruptions?
What causes an eruption to be explosive? A volcano erupts explosively if its magma is high in silica. … In a quiet eruption, the magma is low in silica, allowing the magma to flow out gently. In an explosive eruption, the magma is high in silica, which causes the magma to be thick and sticky.
What is the main hazard from a quiet volcanic eruption?
Hazards from quiet lava flows include igniting fires and producing chlorine-rich gas clouds where lava pours into the sea. Since 1980, as many as five volcanoes have erupted each year in the United States. Eruptions are most likely to occur in Hawaii and Alaska.
What causes a quiet volcanic eruption?
When a volcano has magma that is hot or low in silica a quiet eruption occurs. … The magma that causes quiet eruptions is low in viscosity and is is classified as mafic magma. The mafic magma is rich in magnesium and iron, which causes its dark color. A short, violent, relatively small explosion of viscous magma.
How lava composition determines the type of volcanic eruption?
The crystal and gas content and temperature of a magma help determine a volcano’s eruption style. — Crystals in magma make it more viscous, so magma with a high crystal content is more likely to explode than flow.What is the primary materials ejected from a volcano?
Volcanic eruptions produce three types of materials: gas, lava, and fragmented debris called tephra.
What chemical ultimately determines the type of volcanic eruption that will occur?
Magma Composition
Magma CompositionOne key to what makes the eruption unique is the chemical composition of the magma that feeds a volcano, which determines (1) the eruption style, (2) the type of volcanic cone that forms, and (3) the composition of rocks that are found at the volcano.
What is the biggest factor in determining what type of eruption will happen?
Magma composition impacts nearly everything about a volcano, with viscosity of the melt being one of the most important factors that determines eruption dynamics, and even the shape of a volcanic edifice. Viscosity is the internal friction, or resistance to flow—or how “thick and sticky” or “thin and runny” a lava is.
What would be a likely explanation for the onset of volcanic activity in the central United States?
What would be a likely explanation for the onset of volcanic activity in the central United States? The development of a hot spot or the opening of a rift. How do scientists analyze the materials of the mantle without actually reaching there? By studying the chemical composition of lava.
What are the physical characteristics of a volcano?
They tend to have very steep slopes and are symmetrical. They sometimes rise up to 10,000 feet above sea level and create some of the planet’s most majestic mountains. The eruptions from this type of volcano can often be very violent, throwing rock, ash and lava high into the air.What characteristics of magma determines its explosiveness?
Viscosity, together with the amount of gas dissolved in magma, can determine the explosivity of the eruption. More viscous magma with volatiles is more explosive than less viscous magma, where gases can bubble out relatively easily.
What are the main gases released during a volcanic eruption?
The most common volcanic gas is water vapor, followed by carbon dioxide and sulfur dioxide.
What are the three factors that affect the viscosity of magma?
The three factors that influence the viscosity of a lava are temperature, the dissolved gases it contains, and its chemical composition.
What primary factors determine the nature of volcanic eruptions choose all that apply quizlet?
What factors determine the type of volcanic eruption? Magma composition, magma temperature, and the amount of dissolved gasses in the magma. List the materials ejected from volcanoes. Ash and dust, pumice, cinders, blocks, and bombs.
How might a Laccolith be detected at Earth’s surface before being exposed by erosion?
Why might a laccolith be detected at Earth’s surface before being exposed by erosion? … Domed strata above a laccolith may be exposed at the surface before erosion cuts down far enough to expose the igneous rock. Thus the domed strata may suggest that the top of a laccolith lies a short distance below the surface.
What are the main gases released during a volcanic eruption and what role do gases play in eruptions?
List the main gases released during a volcanic eruption. 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.
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 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 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 are the three main factors that determine the shape of a volcano?
These include: The volume of volcanic products. The interval length between eruptions. The composition of volcanic products.
