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Those that are rich in iron and magnesium.
Wiki User
∙ 14y ago
Wiki User
∙ 12y agoIt's the volcano, less of the magma
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What is the magma composition causes the most violent volcanic eruptions explain?
Felsic magmas produce the most violent reputations. This is because felsic magmas are the most viscous and thus can hold the most gasses. These trapped gases can expand explosively when they reach lower pressure near the surface.
What type of eruptions do mafic magmas cause?
Basaltic magmas are associated with fissure eruptions creating lava flows spilling out from cracks in the crust. This is because basaltic magmas are more viscous and contain a lower concentration of gases than rhyolitic magma and therefore are unable to build up sufficient pressure to produce explosive eruptions.
What is the link between the chemical composition of magma and the type of volcanic activity?
High silica magmas can explode violently as its high viscosity causes a greater build up of pressure inside the volcano. Magmas low in silica tend to produce volcanic eruptions that are runny because of low viscosity.
What volcanic features forms as a result of hydrothermal activity associated with hot volcanic rocks and Magmas?
fumaroles
Plinian eruptions are the most powerful type of eruption They are usually caused by what kind of magma?
Plinian eruptions are usually associated with felsic magmas.
What is the magma composition causes the most violent volcanic eruptions explain?
Felsic magmas produce the most violent reputations. This is because felsic magmas are the most viscous and thus can hold the most gasses. These trapped gases can expand explosively when they reach lower pressure near the surface.
Why do volcanic eruptions differ?
The main cause of differences in volcanic eruption characteristics is due to the viscosity of the magma. High viscosity magmas are high in sticky silica which traps gas and produces explosive eruptions. Low viscosity magmas are low in silica and produce eruptions with far less energetic characteristics.
What type of eruptions do mafic magmas cause?
Basaltic magmas are associated with fissure eruptions creating lava flows spilling out from cracks in the crust. This is because basaltic magmas are more viscous and contain a lower concentration of gases than rhyolitic magma and therefore are unable to build up sufficient pressure to produce explosive eruptions.
What is the link between the chemical composition of magma and the type of volcanic activity?
High silica magmas can explode violently as its high viscosity causes a greater build up of pressure inside the volcano. Magmas low in silica tend to produce volcanic eruptions that are runny because of low viscosity.
What is a circular volcanic vent produced by the explosive energy of gas charged magmas?
Volcanic crater.
What volcanic features forms as a result of hydrothermal activity associated with hot volcanic rocks and Magmas?
fumaroles
Plinian eruptions are the most powerful type of eruption They are usually caused by what kind of magma?
Plinian eruptions are usually associated with felsic magmas.
How does magma composition and the resulting eruption affect the form of a volcano?
If the composition of the magma is high in silica, the eruption will be explosive. The Eruption of Mt. St. Helens was an explosive eruption. If the composition of the magma is low in silica, it will produce a quiet eruption. The eruption(s) of Mt. Kilauea are quiet eruptions.
Do volcanoes always produce lava flows?
No. Lava flow in a volcanic eruption is a factor of the temperature, chemistry, and amount of trapped gas in the lava. Highly viscous, felsic, gas charged magmas tend to explode upon eruption. Low viscosity, basaltic magmas tend to flow upon eruption.
How do mafic volcanic rocks get to Earth's surface?
Pressure from overlying crust forces mantle magmas through cracks to Earth's surface. These magmas erupt out of volcanoes, cool, and solidify into rock.
What does viscosity have to do with eruptions?
The viscosity of magma or lava will determine whether or not the eruption is explosive or quiet. Higher viscosity magma can result in explosive eruptions. Lower viscosity magmas tend to flow more freely.
What kind of eruptions and speed of flow do high silica and low silica magmas have when they erupt as lava?
For eruptions it is explosive and for speed of flow it is 6 miles per hour. When the eruption as lava is 18 miles per hour.
