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What kind of magmas are generated in places where volcanoes erupt both explosively and nonexplosively?
Wiki User
∙ 13y ago
pillow lava.... i think
Wiki User
∙ 13y ago
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Do volcanoes always extrude magmas of the same type?
No
Why are magmas with high silica content dangerous?
High-silica magmas are extremely viscous, and so tend to trap a large amount of gas under pressure. When such magma erupts, it does so explosively.
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.
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 type of magma does a composite volcano have?
Composite volcanoes can contain a wide variaty of magmas ranging from basaltic to rhyolitic.
What kind of magmas are generated in places where volcanos erupt explosively and nonexplosively?
pillow lava.... i think
Do volcanoes always extrude magmas of the same type?
No
What determines the strength of a eruption?
The temperature, the pressure, and the type of magma. High silicate magmas generally erupt explosively.
Why are magmas with high silica content dangerous?
High-silica magmas are extremely viscous, and so tend to trap a large amount of gas under pressure. When such magma erupts, it does so explosively.
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.
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.
Where does andesite form?
Andesite is an extrusive igneous rock found on or near volcanoes that contain intermediate magmas.
What type of magma does a composite volcano have?
Composite volcanoes can contain a wide variaty of magmas ranging from basaltic to rhyolitic.
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 is the relationship in the silicon content and the viscosity of magma?
There is an inverse relationship between magma viscosity and silicon content. Lavas erupting from basaltic volcanoes (like Hawaii) have a much lower viscosity and are much hotter than those erupted by volcanoes whose magmas are rich in silicon. There may be up to 8 orders of magnitude viscosity difference between basaltic magmas (SiO2 contents or about 45 %) and rhyolitic magmas (SiO2 > 70 %).
Do hot spot volcanoes tend to erupt more explosively than other volcano?
The source is not as important as the gas content and viscosity. For example, Kilauea in Hawaii doesn't erupt very explosively; it is just a fire fountain. The more explosive volcanoes are those with a blocked magma chamber that builds pressure under a solid surface. Hotspot volcanoes tend to be less explosive because most are on the seafloor.
Why are granitic magmas thicker than basaltic magmas?
granitic magmas contain more silica than basaltic magmas.
