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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.
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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 Felsic magmas different from mafic magmas in color temperate minerals composition and the kind of rock each form?
Mafic lava is less viscous(runnier) than felsic lava due to a lower silica content. This causes non-violent eruptions such as in the Hawaiian Islands. Mafic lava tends to be associated more with interplate volcanism and mid-ocean ridges and produces the rock type known as basalt. (The ocean floor is made of basalt.) Felsic lava is mainly found at convergent zones (areas of colliding plates) and has a high silica and water content which causes the lava to be highly viscous and causes very violent eruptions. This lava produces rhyolite and andesitic rocks. The color of the rocks formed by magmas is a consequence of its composition, mafic magmas are dark colored (Mg-Fe) and felsic magmas are light colored (Feldspars-Si).
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 type of magma that tends to cause explosive eruptions has a what?
High temperature
Do volcanoes always extrude magmas of the same type?
No
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 Felsic magmas different from mafic magmas in color temperate minerals composition and the kind of rock each form?
Mafic lava is less viscous(runnier) than felsic lava due to a lower silica content. This causes non-violent eruptions such as in the Hawaiian Islands. Mafic lava tends to be associated more with interplate volcanism and mid-ocean ridges and produces the rock type known as basalt. (The ocean floor is made of basalt.) Felsic lava is mainly found at convergent zones (areas of colliding plates) and has a high silica and water content which causes the lava to be highly viscous and causes very violent eruptions. This lava produces rhyolite and andesitic rocks. The color of the rocks formed by magmas is a consequence of its composition, mafic magmas are dark colored (Mg-Fe) and felsic magmas are light colored (Feldspars-Si).
What type of magma is thin moves quickly and flows smoothly?
This would be a lava such as basalt. Note well that when basalt starts to cool it rapidly increases in viscocity and so it's flow rate reduces dramatically.
What type of eruptions cause a cinder cone?
Explosive
What is a type of mafic phaneritic rock?
Gabbro is a type of mafic, phaneritic igneous rock.
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 type of magma that tends to cause explosive eruptions has a what?
High temperature
Do volcanoes always extrude magmas of the same type?
No
What type of magma is dark in color?
Mafic
This type of magma is dark in color?
mafic
What type of magma does surtsey have?
mafic magma
What lava type does the Santa Ana volcano have?
Mafic
