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What type of magma causes quiet eruption?
Magma with low viscosity, such as basaltic magma, typically causes quiet eruptions. This type of magma flows easily and allows gases to escape, resulting in relatively gentle eruptions with less explosive activity.
Why can lava be explosive or non explosive?
Lava can be explosive if it is high in gas content, such as dissolved water vapor or carbon dioxide, which can cause pressure to build up and lead to explosive eruptions. On the other hand, lava can be non-explosive if it is low in gas content and flows more easily without building up pressure, resulting in effusive eruptions with slower lava flows.
What are the two factors the control whether a volcano eruption will be explosive or quiet?
The two main factors that control whether a volcano eruption will be explosive or quiet are the viscosity of the magma and the presence of dissolved gases. High viscosity magma (thick and sticky) and high gas content tend to result in explosive eruptions, whereas low viscosity magma (thin and runny) and low gas content lead to quiet eruptions.
Does ash form when thin runny lava hardens?
No. Ash forms when gas-rich magma is blown into fine droplets during explosive eruptions, quickly cooling to form tiny particles of glass.
Why is the amount of Silica in magma important?
The amount of silica in magma determines its viscosity or flowability. Magma with high silica content is more viscous and tends to trap gases, leading to explosive eruptions. Low-silica magma has lower viscosity and allows gas to escape more easily, resulting in less explosive eruptions.
What conditions make for a week volcanic?
The answer is : Magma with low viscosity. It makes for a weak volcanic eruption. If the viscosity is low (thin), non-explosive eruptions usually begin with fire fountains due to release of dissolved gases. When magma reaches the surface of the earth, it is called lava.
How does the viscosity of magma contrast in quiet and explosive eruptions?
Effusive eruptions occur when hot basalt magmas reach the surface allowing gases to escape easily as the magma erupts. Explosive eruptions occur where cooler, more viscous magmas reach the surface. The gases cannot escape as easily, so pressure builds up until the gasses violently blast out rock and lava.
Does a shield volcan have thick magma?
No, a shield volcano typically has relatively thin, low-viscosity magma, which allows it to flow easily over long distances. This type of magma, primarily basalt, leads to the broad, gently sloping shape characteristic of shield volcanoes. The fluid nature of the magma results in less explosive eruptions compared to stratovolcanoes, which have thicker, more viscous magma.
What condition make for a week volcanic eruption?
The answer is : Magma with low viscosity. It makes for a weak volcanic eruption. If the viscosity is low (thin), non-explosive eruptions usually begin with fire fountains due to release of dissolved gases. When magma reaches the surface of the earth, it is called lava.
Is the magma in a cinder cone thick or thin?
The magma in a cinder cone is typically thick, meaning it has high viscosity. This is because cinder cone volcanoes are formed from highly viscous and gas-rich magma which tends to solidify quickly, leading to the formation of cinders and ash during eruptions.
Why are ash cinders and bombs produced only in explosive volcano eruptions?
Ash, cinders and bombs only come from explosive eruptions because quiet eruptions really only spew thin lava, not thick and sticky lava like explosive ones. The thick lava can get caught inside the pipe leading to the vent, which can cause more and more pressure to build up. When the volcano's side gives in, or when the lava finally gets to the vent, it ends up exploding, making ash, cinders and bombs.
The volcanoes of Hawaii form fron thin basaltic magma that tends to erupt quietly What is one reason for the quiet eruptions?
Basaltic magma allows dissolved gases to bubble upward and escape
