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Silica-poor magmas, typically basaltic in composition, have lower viscosity compared to silica-rich magmas. This lower viscosity allows them to flow easily and spread over large distances, resulting in the formation of broad, gently sloped volcanoes. The fluid nature of these eruptions generally leads to less explosive activity, contributing to the broad shape of the volcano. Consequently, the accumulation of layers of low-viscosity lava contributes to the characteristic gentle slopes.
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Why do silica poor magmas produce broad volanoes with gentle slopes?
Silica-poor magmas, typically basaltic in composition, have lower viscosities compared to silica-rich magmas. This low viscosity allows the magma to flow easily and spread out over large distances, leading to the formation of broad, gently sloping volcanoes. Additionally, the lower gas content in silica-poor magmas results in less explosive eruptions, further contributing to the gentle profile of these volcanic structures. As a result, the accumulation of lava flows creates a wide, shield-like shape characteristic of shield volcanoes.
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.
Why do silica-poor magmas produce broad volcanoes with gentle slopes?
Silica poor magma is generally low in viscosity, and is therefore more fluid. The lava can travel a great distance before solidifying, thus creating broad gentle slopes.
Do shield volcanoes have high silica or low silica?
Shield volcanoes have low silica magma, which is more fluid and runny compared to magma with higher silica content. This low silica content contributes to the gentle, flowing eruptions characteristic of shield volcanoes.
Why are granitic magmas thicker than basaltic magmas?
Granitic magmas are thicker than basaltic magmas because they have higher silica content, which increases viscosity. The higher silica content leads to stronger bonding between the silica tetrahedra, making it more difficult for the magma to flow. Basaltic magmas, on the other hand, have lower silica content and are less viscous, allowing them to flow more easily.
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.
Why do silica-poor magmas produce broad volcanoes with gentle slopes?
Silica poor magma is generally low in viscosity, and is therefore more fluid. The lava can travel a great distance before solidifying, thus creating broad gentle slopes.
Why do silica -poor magmas produce broad volcanoes with gentle slopes?
Silica poor magma is generally low in viscosity, and is therefore more fluid. The lava can travel a great distance before solidifying, thus creating broad gentle slopes.
Do shield volcanoes have high silica or low silica?
Shield volcanoes have low silica magma, which is more fluid and runny compared to magma with higher silica content. This low silica content contributes to the gentle, flowing eruptions characteristic of shield volcanoes.
Why are granitic magmas thicker than basaltic magmas?
Granitic magmas are thicker than basaltic magmas because they have higher silica content, which increases viscosity. The higher silica content leads to stronger bonding between the silica tetrahedra, making it more difficult for the magma to flow. Basaltic magmas, on the other hand, have lower silica content and are less viscous, allowing them to flow more easily.
Do shield volcanoes have high silica content in the lava?
No, shield volcanoes typically have low silica content in their lava, which results in fluid-like, runny eruptions. This low silica content allows for the lava to flow easily and create the wide, gentle slopes characteristic of shield volcanoes.
What is a magmas viscosity related to?
The silica content. A higher silica content results in a more viscous magma.
What is Mt Fuji's magmas viscosity?
Mount Fuji's magma is known to have relatively low viscosity compared to other volcanoes, which contributes to its more gentle eruptions. This low viscosity magma allows for gases to escape more easily, reducing the likelihood of explosive eruptions.
Why do silica-poor magma produce broad volcanoes with gentle slopes?
Silica poor magma is generally low in viscosity, and is therefore more fluid. The lava can travel a great distance before solidifying, thus creating broad gentle slopes.
How are felsic magmas formed and what are the processes involved in their creation?
Felsic magmas are formed through the partial melting of continental crust rocks, which are rich in silica and aluminum. This process typically occurs at subduction zones or during continental collisions. The high silica content of felsic magmas makes them viscous and prone to explosive eruptions.
Why is the silica content of lava important?
The more silica crystal within the magma, the more viscous the magma is, because of crystals sticking together. So magma with low silica content is runny, and wiht just flow gently out of a volcano, like in hawai, but viscous (sticky, like honey) magma will not, and gas gets trapped within it, and then explodes out, cause large scale explosive erruptions.
Which type of magma causes quiet volcanoes?
Mafic magma (low in silica content) typically causes quiet eruptions because it is less viscous and flows more easily, leading to gentle lava flows. These eruptions are characterized by low explosivity and can result in shield volcanoes or lava plateaus.
