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Correct order of decreasing magma viscosity?
The amount of viscosity present in magma depends on the amount of silica it has. A composite volcano produces rhyolitic lava which is very thick. A shield volcano produces a basaltic lava with less silica and significantly less viscosity.
What kind of lava forms shield volcanoes?
Shield volcanoes are fed by basaltic magma.
In a strombolian eruption the percent of silica changes?
Silica content in strombolian eruptions is typically low (around 50-52%), as they are characterized by the eruption of basaltic magma. This type of magma has a lower silica content compared to other types such as andesitic or rhyolitic magmas, which are associated with different types of volcanic eruptions like explosive ones.
What type of magma did the mauna kea volcano have?
The Hawaiian Islands were formed by coalesing shield volcanoes. These volcanoes are exclusively composed of Basalt lava. The lava does not readily trap gas and flows very easily giving Mauna Loa, and Kiluaea there pronounced rounded shapes we see today.
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 is the difference between basaltic magma and silicic magma?
Granitic rocks are intrusive, which means they crystallized underground. Basaltic rocks are extrusive, meaning they crystallized above ground. Also, basaltic rocks are more mafic, and granitic rocks are more felsic.
Compare and contrast the three types of magma?
Basaltic magma is low in silica and fluid, resulting in low viscosity and eruptions that are generally less explosive. Andesitic magma has a moderate silica content and viscosity, leading to eruptions that can be more explosive than basaltic. Rhyolitic magma is high in silica and has high viscosity, causing very explosive eruptions.
Correct order of decreasing magma viscosity?
The amount of viscosity present in magma depends on the amount of silica it has. A composite volcano produces rhyolitic lava which is very thick. A shield volcano produces a basaltic lava with less silica and significantly less viscosity.
What kind of lava forms shield volcanoes?
Shield volcanoes are fed by basaltic magma.
In a strombolian eruption the percent of silica changes?
Silica content in strombolian eruptions is typically low (around 50-52%), as they are characterized by the eruption of basaltic magma. This type of magma has a lower silica content compared to other types such as andesitic or rhyolitic magmas, which are associated with different types of volcanic eruptions like explosive 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.
What type of magma did the mauna kea volcano have?
The Hawaiian Islands were formed by coalesing shield volcanoes. These volcanoes are exclusively composed of Basalt lava. The lava does not readily trap gas and flows very easily giving Mauna Loa, and Kiluaea there pronounced rounded shapes we see today.
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 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.
What is an eruption called when the magma is thin runny and contains very little silica?
An eruption with thin, runny magma containing very little silica is called an effusive eruption. This type of eruption usually results in lava flows that can travel long distances from the volcano.
What is the consistency of basaltic lava?
No, it is actually one of the less viscous.The viscosity increasing when the composition of Felsic minerals make larger.That is, basalt lavas are more fluent than felsic lavas such as lavas from andesite of rhyolite. Also, the more viscosity, the more explosive.
What are the two types of magma and what makes them different?
The two main types of magma are basaltic and andesitic. Basaltic magma is low in silica content, making it more fluid and less viscous, while andesitic magma has higher silica content and is more viscous. This difference in viscosity affects how easily the magma can flow and the types of volcanic eruptions it can cause.
