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Why are some volcanoes more destructive then others?
Well, all volcanoes create land, but explosive volcanoes also destroy land. Explosive volcanoes are explosive because they have a lot of gas and pressure inside them, and then the pressure suddenly drops. That's when the volcano starts erupting.
Why are the eruptions of stratovolcanoes usually more destructive than the eruptions of cinder cone volcanoes?
Cindercone volcanoes erupt relative small amounts of magma, compared with stratovolcanoes, which not only hold more magma, but often more viscous magma with a higher gas content. This means eruptions tend to be larger and more explosive. As a result, cinder cones primarily erupt fountains of lava while stratovolcanoes tend to erupt massive ash clouds and pyroclastic flows.
What are the characteristics of divergent-boundary volcanoes and convergent boundary volcanoes?
Divergent boundary volcanoes are associated with mid-ocean ridges where tectonic plates are moving apart, resulting in upwelling magma forming new crust. These volcanoes tend to produce basaltic lava flows with gentle slopes and low viscosity. Convergent boundary volcanoes occur at subduction zones where one plate is being forced beneath another, leading to the melting of rock and explosive eruptions. These volcanoes typically produce andesitic or rhyolitic magma leading to more explosive eruptions with steep-sided cones.
What type of eruptions would you expect the volcanoes to have?
The type of eruptions you can expect from a volcano largely depends on its magma composition and the tectonic setting. Volcanoes with basaltic magma, often found at divergent boundaries or hotspots, typically exhibit effusive eruptions, producing lava flows. In contrast, those with more viscous, silica-rich magma, often associated with convergent boundaries, tend to have explosive eruptions, characterized by ash clouds and pyroclastic flows. Overall, the eruption style can range from gentle lava flows to violent explosive events.
What Tend to increase the explosive potential of magma body beneath a volcano?
high viscosity and dissolved gas
Do hot spot volcanoes tend to erupt more explosively than other volcanoes?
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 some volcanoes more destructive then others?
Well, all volcanoes create land, but explosive volcanoes also destroy land. Explosive volcanoes are explosive because they have a lot of gas and pressure inside them, and then the pressure suddenly drops. That's when the volcano starts erupting.
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 volcano produces fluid basaltic lava?
Shield volcanoes produce fluid basaltic lava due to their gently sloping sides and low viscosity magma. These eruptions tend to be non-explosive and create broad, flat volcanoes over time.
Why are the eruptions of stratovolcanoes usually more destructive than the eruptions of cinder cone volcanoes?
Cindercone volcanoes erupt relative small amounts of magma, compared with stratovolcanoes, which not only hold more magma, but often more viscous magma with a higher gas content. This means eruptions tend to be larger and more explosive. As a result, cinder cones primarily erupt fountains of lava while stratovolcanoes tend to erupt massive ash clouds and pyroclastic flows.
What are the characteristics of divergent-boundary volcanoes and convergent boundary volcanoes?
Divergent boundary volcanoes are associated with mid-ocean ridges where tectonic plates are moving apart, resulting in upwelling magma forming new crust. These volcanoes tend to produce basaltic lava flows with gentle slopes and low viscosity. Convergent boundary volcanoes occur at subduction zones where one plate is being forced beneath another, leading to the melting of rock and explosive eruptions. These volcanoes typically produce andesitic or rhyolitic magma leading to more explosive eruptions with steep-sided cones.
What Tend to increase the explosive potential of magma body beneath a volcano?
high viscosity and dissolved gas
What volcano is going to have the bigger explosion a short volcano or a tall volcano?
On average, taller volcanoes tend to have more explosive eruptions because they typically contain more viscous magma that traps gases. Shorter volcanoes, like shield volcanoes, usually erupt less explosively with more fluid lava flows. However, the explosivity of a volcano can also depend on other factors such as magma composition and gas content.
What does viscosity have to do with eruptions?
The viscosity of magma or lava will determine whether or not the eruption is explosive or quiet. Higher viscosity magma can result in explosive eruptions. Lower viscosity magmas tend to flow more freely.
Are the Eyjafjallajokull eruptions violent or mild?
The eruptions would normally be passive in nature, however when the magma mixes with the glaciers present on the volcano it gets more explosive. The volcano is of the same style as Hawaiian volcanoes, however, with the presence of ice the eruptions tend to produce large amounts of steam and ash that can cause explosive outbursts.
What type of material is ejected from a plug dome volcano?
Plug dome volcanoes typically eject viscous magma, which is known as rhyolite lava. This lava is thick and flows slowly, leading to the formation of steep-sided domes as it cools and hardens. As a result, plug dome volcanoes tend to have explosive eruptions due to the high pressure build-up of gas within the viscous magma.
A volcano with a magma supply which is felsic and has a high viscosity will tend to have what type of eruption?
A volcano with felsic magma and high viscosity will likely have explosive eruptions due to the build-up of pressure from gas bubbles being trapped within the thick magma. This can lead to violent eruptions with ash, gas, and volcanic rocks being ejected forcefully from the volcano.
