0
What else can I help you with?
What effect does silicia content have on the characteristics of magma?
Silica-rich magma is much more thick and viscous.
Explain how the presence of silica and water in magma increases the chances of an explosive eruption?
The higher the silica content of the magma, the more explosive the eruption. Magma enriched in silica has a higher viscosity (resistance to flow). Pressures are more likely to build up behind the thicker, high silica content magma and result in potentially more explosive eruptions.
Does the increase in silica increase the viscosity of a magma?
it is normally intermediate flow because of the silica content.
Why are silica-rich magmas thicker than silica-poor magma?
The SiO4 tetrahedra continuously form bonds with adjacent ions and atoms, essentially causing the liquid to strik to itself.
What does magma with high silica content form?
When it cools and crystallizes into rock, the rock will be described as felsic igneous rock. Examples of felsic igneous rocks are granite, rhyolite, and pumice.
Do silica-rich magma cause explosive eruptions?
yes
Why is silica rich magma associated with explosive eruptions?
Silica-rich magma has high viscosity, which can trap gas bubbles. When pressure builds up, the gas can cause explosive eruptions as it tries to escape through the thick magma. The high silica content also promotes the formation of explosive pyroclastic materials during an eruption.
What is Krakatoa a silica rich or a silica poor?
Krakatoa is silica-rich, meaning it contains a high amount of silicon dioxide (silica) in its composition. This high silica content is associated with explosive volcanic eruptions due to the interaction between silica and magma.
What type of magma do highly explosive volcanoes have?
Highly explosive volcanoes typically have viscous, silica-rich magma known as rhyolitic magma. This type of magma contains high amounts of gas and is prone to causing explosive eruptions due to the trapped pressure within the magma chamber.
What term is used to describe magma that is rich in feldspars and silica?
Felsic magma. This type of magma is viscous with high silica content, resulting in explosive eruptions and the formation of light-colored rocks.
Does low silica magma cause explosive volcanic eruptions?
Not usually. Explosive eruptions are more often to magma with high or moderate silica levels.
Is mount Popocatepetl high in Silica?
Yes, Mount Popocatepetl is high in silica because it is a stratovolcano, which typically contains high amounts of silica in its magma composition. Silica-rich magma tends to be more viscous, leading to explosive eruptions as seen with the eruptions of Popocatepetl.
How the composition of magma determines an eruption's characteristics?
Silica(te) rich magma is usually an explosive eruption. The explosiveness of an eruption depends on - a) Gases trapped within the magma at eruption b) The Silica content c) The fragility of the crater walls and/or the volcanic plug.
Why silica rich magma is more dangerous than iron rich magma?
The silica-rich magma, also called felsic magma, is more viscous than iron-rich or mafic magma. This means resists flow more (just as syrup is more viscous than water). The high viscosity means that the felsic magma can trap more gasses, leading to explosive eruptions, rather than effusive ones.
What is Silica rich thick magma called?
Silica-rich thick magma is called rhyolite. It contains high levels of silica, making it very viscous and typically light in color. Rhyolite is associated with explosive volcanic activity due to the build-up of pressure caused by the slow movement of its thick lava.
Does Mount Shasta have high silica?
Yes, Mount Shasta has high silica content in its volcanic rocks. Silica-rich magma is one of the reasons for the explosive nature of some volcanic eruptions in the region.
What magma is silica-rich thick magma?
An acid magma or a granitic magma.
