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Why do volcanoes with very viscous magmas erupt the most explosively?
Volcanoes with very viscous magmas tend to erupt explosively due to the high resistance to gas escape. When magma is thick and sticky, gas bubbles can become trapped, leading to increased pressure within the magma chamber. Once the pressure exceeds the strength of the surrounding rock, it results in a violent eruption as the gas escapes rapidly, fragmenting the magma into pyroclastic material and causing explosive outbursts. This is contrasted with low-viscosity magmas, which allow gases to escape more easily and typically result in effusive eruptions.
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.
Is Shield volcanoes found along subduction zones?
Cone volcanoes which are likely to erupt explosively are found at subduction zones. Spreading zones (constructive plate boundaries) and hot spots produce quieter volcanoes because their lava is thinner. The ones at hot spots are shield volcanoes.
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 magma does a composite volcano have?
Composite volcanoes typically have andesitic magma, which is intermediate in composition between felsic and mafic magmas. This type of magma is more viscous than mafic magma, leading to explosive eruptions and the buildup of lava and ash layers that form the characteristic steep-sided cone shape of composite volcanoes.
What kind of magmas are generated in places where volcanos erupt explosively and nonexplosively?
pillow lava.... i think
Why do volcanoes with very viscous magmas erupt the most explosively?
Volcanoes with very viscous magmas tend to erupt explosively due to the high resistance to gas escape. When magma is thick and sticky, gas bubbles can become trapped, leading to increased pressure within the magma chamber. Once the pressure exceeds the strength of the surrounding rock, it results in a violent eruption as the gas escapes rapidly, fragmenting the magma into pyroclastic material and causing explosive outbursts. This is contrasted with low-viscosity magmas, which allow gases to escape more easily and typically result in effusive eruptions.
What determines the strength of a eruption?
The temperature, the pressure, and the type of magma. High silicate magmas generally erupt explosively.
How are felsic magmas formed?
Heat from the mantle melts part of the lower crust
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.
Where does andesite form?
Andesite is an extrusive igneous rock found on or near volcanoes that contain intermediate magmas.
Is Shield volcanoes found along subduction zones?
Cone volcanoes which are likely to erupt explosively are found at subduction zones. Spreading zones (constructive plate boundaries) and hot spots produce quieter volcanoes because their lava is thinner. The ones at hot spots are shield volcanoes.
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.
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.
What type of magma does a composite volcano have?
Composite volcanoes typically have andesitic magma, which is intermediate in composition between felsic and mafic magmas. This type of magma is more viscous than mafic magma, leading to explosive eruptions and the buildup of lava and ash layers that form the characteristic steep-sided cone shape of composite volcanoes.
Do volcanoes always extrude magmas of the same type?
No, volcanoes can extrude a variety of magma types, which can vary in composition, temperature, and viscosity. Different types of volcanoes, like stratovolcanoes and shield volcanoes, often produce different types of magma due to variations in geological conditions and processes.
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.
