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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.
Are Hawaiian volcanoes high in silica?
Hawaiian volcanoes are generally low in silica compared to other types of volcanoes, such as those that produce andesitic or rhyolitic lava. The primary type of lava produced by Hawaiian volcanoes is basalt, which has a lower silica content, typically ranging from about 45% to 55%. This low silica content contributes to the fluidity of the lava, resulting in the characteristic broad, shield-like shapes of Hawaiian volcanoes.
What kind of rock is found in a shield volcano?
Shield volcanoes are primarily composed of basaltic rock, which is a type of volcanic rock that is low in silica content and high in iron and magnesium. This type of rock creates gently sloping shield volcanoes due to its low viscosity and ability to flow easily during eruptions.
How does silica affect the shape of a volcano?
High silica content in magma can lead to explosive eruptions and the formation of steep-sided volcanoes, such as stratovolcanoes. This is because high silica magma is thicker and more viscous, which traps gases and builds up pressure before erupting violently. The high viscosity of silicic magma prevents it from easily flowing, resulting in the steep shape of the volcano.
Does the composite volcano have high viscosity?
Composite volcanoes typically have higher viscosity lava compared to shield volcanoes, resulting in more explosive eruptions. The high silica content in the magma of composite volcanoes contributes to this higher viscosity. However, the exact viscosity of the lava can vary depending on specific factors such as temperature and gas content.
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.
How are shield volcanoes and cinder cone volcanoes somewhat same?
Both erupt basaltic lava, which has a low silica content and a high temperature.
What two properties of magma determine what kind of volcano will form?
The silica content and the gas content of magma are two properties that determine what kind of volcano will form. Magma with low silica content and low gas content tends to form effusive, shield volcanoes, while magma with high silica content and high gas content tends to form explosive, stratovolcanoes.
Do shield volcanoes have high viscosity?
No, shield volcanoes have low viscosity lava due to their composition of basaltic magma, which has low silica content. This low viscosity allows the lava to flow easily and spread out over a wide area, resulting in the gentle, sloping shape characteristic of shield volcanoes.
What kind of rock is found in a shield volcano?
Shield volcanoes are primarily composed of basaltic rock, which is a type of volcanic rock that is low in silica content and high in iron and magnesium. This type of rock creates gently sloping shield volcanoes due to its low viscosity and ability to flow easily during eruptions.
How does silica affect the shape of a volcano?
High silica content in magma can lead to explosive eruptions and the formation of steep-sided volcanoes, such as stratovolcanoes. This is because high silica magma is thicker and more viscous, which traps gases and builds up pressure before erupting violently. The high viscosity of silicic magma prevents it from easily flowing, resulting in the steep shape of the volcano.
Does the composite volcano have high viscosity?
Composite volcanoes typically have higher viscosity lava compared to shield volcanoes, resulting in more explosive eruptions. The high silica content in the magma of composite volcanoes contributes to this higher viscosity. However, the exact viscosity of the lava can vary depending on specific factors such as temperature and gas content.
What is magma that has a low silica content called?
Magma with low silica content is called mafic magma. It is characterized by its high temperature, low viscosity, and dark-colored minerals like olivine and pyroxene. Mafic magma typically erupts from shield volcanoes and is associated with basaltic rocks.
What kind of volcano form from lava that is higher in water and silica content than lava that forms shield volcanoes?
Explosive stratovolcanoes form from lava that is higher in water and silica content than the lava that forms shield volcanoes. The high viscosity of this type of lava traps gases, leading to explosive eruptions that can eject ash, rock fragments, and lava at high speeds. This creates steep-sided volcanic cones with alternating layers of ash, lava, and volcanic rocks.
What is common of most volcanoes that have the most violent eruptions?
They feature magma with very high silica content.
What is the silica and water content of mt Cleveland?
Mount Cleveland, a stratovolcano in Alaska, typically has a high silica content in its volcanic rocks, which is common for volcanoes in the Aleutian arc. The specific silica content can vary depending on the eruption. The water content in Mount Cleveland's magma is also high, contributing to its 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.
