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A characteristic of lava that determines the force of a volcanic eruption is?
The silica content of the lava plays a key role in determining the force of a volcanic eruption. High silica content makes lava more viscous, leading to more explosive eruptions, while low silica content results in less viscous lava and less explosive eruptions.
Explain why volcanic blocks would be uncommon on shield volcanoes?
Shield volcanoes are formed by the relatively quiet outpouring of lava, which results in a broad and gently sloping shape. Volcanic blocks are typically associated with explosive eruptions that occur in stratovolcanoes, where gas pressure causes fragmented volcanic material to be ejected. As shield volcanoes tend to have less explosive eruptions, the formation of volcanic blocks on their slopes is rare.
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.
Cinder cones are the most potentially dangerous volcanoes because they generate the most explosive eruptions?
While cinder cones do have the potential for explosive eruptions, they are generally considered less dangerous than stratovolcanoes due to their smaller size and lower frequency of eruptions. Stratovolcanoes can produce more violent and destructive eruptions.
What kind of magmas produce violent volcanic eruptions?
Magmas with high viscosity and gas content tend to produce violent volcanic eruptions. High viscosity magmas are thicker and have more difficulty releasing gas, leading to pressure build-up and explosive eruptions. This often occurs with felsic or rhyolitic magmas.
A characteristic of lava that determines the force of a volcanic eruption is?
The silica content of the lava plays a key role in determining the force of a volcanic eruption. High silica content makes lava more viscous, leading to more explosive eruptions, while low silica content results in less viscous lava and less explosive eruptions.
Explain why volcanic blocks would be uncommon on shield volcanoes?
Shield volcanoes are formed by the relatively quiet outpouring of lava, which results in a broad and gently sloping shape. Volcanic blocks are typically associated with explosive eruptions that occur in stratovolcanoes, where gas pressure causes fragmented volcanic material to be ejected. As shield volcanoes tend to have less explosive eruptions, the formation of volcanic blocks on their slopes is rare.
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.
Cinder cones are the most potentially dangerous volcanoes because they generate the most explosive eruptions?
While cinder cones do have the potential for explosive eruptions, they are generally considered less dangerous than stratovolcanoes due to their smaller size and lower frequency of eruptions. Stratovolcanoes can produce more violent and destructive eruptions.
Why do volcanic eruptions differ?
The main cause of differences in volcanic eruption characteristics is due to the viscosity of the magma. High viscosity magmas are high in sticky silica which traps gas and produces explosive eruptions. Low viscosity magmas are low in silica and produce eruptions with far less energetic characteristics.
When a fissure eruptions occur on continents?
Fissure eruptions on continents occur when tectonic forces cause the Earth's crust to crack open and release magma. This magma can flow out of the fissure as lava, creating long lines of volcanic activity. Fissure eruptions can be more gradual and less explosive compared to central vent eruptions.
What kind of magmas produce violent volcanic eruptions?
Magmas with high viscosity and gas content tend to produce violent volcanic eruptions. High viscosity magmas are thicker and have more difficulty releasing gas, leading to pressure build-up and explosive eruptions. This often occurs with felsic or rhyolitic magmas.
Is mount Fuji an explosive volcano or a non-explosive volcano?
Mount Fuji is considered a stratovolcano, which means it has the potential for both explosive and non-explosive eruptions. Historically, it has exhibited explosive behavior, particularly during its last major eruption in 1707. However, eruptions can vary in intensity, and some eruptions may be non-explosive, characterized by lava flows rather than explosive ash clouds. Overall, while it has the capability for explosive eruptions, it can also produce less violent activity.
What element has the greatest effect on magma characteristics?
The silica content in magma has the greatest effect on its characteristics. High silica content makes magma more viscous and results in explosive volcanic eruptions, while low silica content produces runny magma and less explosive eruptions.
Why are pilnian eruptions move violent then hawaiin eruptions?
Plinian eruptions are more violent than Hawaiian eruptions because they involve highly viscous magma that traps gas bubbles, leading to increased pressure buildup and explosive eruptions. In contrast, Hawaiian eruptions involve less viscous magma with low gas content, allowing the gases to escape easily and resulting in more effusive, less explosive eruptions.
What is a vulcanian eruption?
A Vulcanian eruption is a type of volcanic eruption characterized by short explosive bursts of gas-charged magma. These eruptions often result in ash columns, pyroclastic flows, and volcanic bombs being ejected from the volcano. Vulcanian eruptions are typically smaller and less violent than Plinian eruptions.
What is more destructive vulcanian or fissure?
Vulcanian eruptions are generally more destructive than fissure eruptions. Vulcanian eruptions are characterized by explosive activity that can launch ash, gas, and volcanic rocks into the atmosphere, posing significant risks to nearby communities and infrastructure. In contrast, fissure eruptions typically involve the outpouring of lava from long cracks in the ground, which, while potentially damaging, usually result in less immediate danger to life and property compared to the explosive nature of Vulcanian eruptions.
