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The three types of magma, named for the rock they form are basaltic, rhyolitic and andesitic. Rhyolitic magma is rich in silica and water vapor.
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Igneous rocks that are dense and dark colored they form from magma that is rich in iron and magnesium and poor in silica?
Igneous rocks that are dense and dark-colored are called basaltic rocks. They are formed from magma that is rich in iron and magnesium and poor in silica content.
What makes magma thicker?
If there is a high silica content in the magma, the eruption is usually more violent and explosive. Magma with a high silica content flows slower so pressure can build up and eventually erupt.
What is the term used to describe igneous rocks or magma rich in Fe-Mg content and low in silica?
Low silica defines BASALTIC rocks. Iron rich is defined by FERROUS. Not sure about Mg though. Mineral rich is a good one...
How are amethysts formed?
I think like granite, amethysts are formed from magma deep underground. This helps them to cool slowly forming the large crystals they have.
Would you expect a light gray igneous rock to be rich or poor in silica?
rich
What are silica rich and thick magma is what?
Silica is sand dust.
What magma is silica-rich thick magma?
An acid magma or a granitic magma.
What effect does silicia content have on the characteristics of magma?
Silica-rich magma is much more thick and viscous.
What kind of magma is silica-rich thick magma?
Viscose lava e.g. andesitic or rhyolitic. This might not be the definition your looking for though.
What magma is rich in feldspars and silica?
no its the least silica rich of granitic and andesitic magma.
What kind of silica do strato volcanos have?
silica-rich magma
What type of magma produces violent reaction?
Acidic lava is very viscous, and thus will harden and block the vent. The magma will force its way out through the vent and create a violent explosion.
Why is silica rich magma associated with explosive eruptions?
silica rich magma associated with explosive eruptions because it tends to trap water and gas bubbles :)
Magma that is high in silica and produces explosive eruptions?
High silica magma is light in color, thick, sticky and less dense than basalt magma. The magma that forma volcanoes is rich in silica. High silica magma have low temperatures because magma that is high in silica have the lowest temperatures. Silica rich magma builds a tall cone shaped volcano, a Stratovolcano. Magma that is high in silica resists flowing, so expanding gases are trapped in it. Pressure builds up until the gases blast out in a violent, dangerous explosion.
What color is silica rich magma?
red or scarlet
Is granitic magma very silica-rich.?
Yes
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.
