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Why does Silica content in most magmas range from 45 to almost 80 percent by weight?
Wiki User
∙ 9y ago
Silicon is one of the most abundant elements in the crust and mantle. Since all magmas are derived from the crust or mantle, the silica content will be significant, and dependent on its source for its constituent percentage.
Wiki User
∙ 9y ago
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What is Mt Fuji's magmas viscosity?
It is quite viscous with a high silica content.
What mineral determines magma viscosity?
A magma's viscosity is directly related to its degree of silica content.
Are magmas classified as intrusive and extrusive?
False there classified as basaltic, andesitic and rhyolitic based on amount of silica.
What is the difference between felsic intermediate and mafic igneous rocks?
Silica content increases from mafic to felsic, and Mg and Fe content decreases. These differences affect things such as viscosity, density and colour. Felsic magmas are the most viscous and least dense, and felsic rocks are the lightest in colour.
What is the relationship between magma and minerals?
No, magma is molten rock, and it is a semi liquid that exists below the surface (when it's above the surface, it's called lava). When magma cools underground it becomes an intrusive igneous rock which is composed of combinations of various minerals.
What is a magmas viscosity related to?
The silica content. A higher silica content results in a more viscous magma.
A magmas viscosity is directly related to its?
silica content
What is Mt Fuji's magmas viscosity?
It is quite viscous with a high silica content.
Why are magmas with high silica content dangerous?
High-silica magmas are extremely viscous, and so tend to trap a large amount of gas under pressure. When such magma erupts, it does so explosively.
What is the silica content of quartz?
Silica is silicon dioxide, the most common component found in rocks and minerals. The composition of different types of magmas are assessed partly based on silica content, or the amount of silica in them. This content significantly affects how the lava behaves.
What is the relationship between silicon content and the viscosity of magma?
Although other factors such as temperature and water content also affect the viscosity of magma, silica-rich magmas tend to be more viscous than silica-poor magmas in similar situations.
Why are granitic magmas thicker than basaltic magmas?
granitic magmas contain more silica than basaltic magmas.
Why do silica-poor magmasproduce broad volcanoes with general slopes?
Because low silica magmas tend to be hotter and more fluid/runny than high silica magmas.
How hot does magma have to be to explode?
The explosive potential of magma depends more on viscosity gas content than on temperature. Most magmas are at temperature of at least 700 degrees Celcius. Interestingly, the most explosive magmas are the high-silica magmas, which have lower melting temperatures.
Does less silica equal greater viscosity?
No. Higher silica magmas tend to be more viscous.
What mineral determines magma viscosity?
A magma's viscosity is directly related to its degree of silica content.
After what are magmas named?
Magmas are named according to their percentage of silicate mineral content .
