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Often, eruptions occur due to "tectonic activity" which is the movement of tectonic plates that make up the earths crust at boundaries between plates (usually destructive tectonic boundaries). Beneath the earths crust is the mantle - a huge layer of molten rock and magma. When tectonic plates move suddenly e.g. when there is an earthquake, gaps and cracks created in the tectonic plates allow magma to rise up to the surface and erupt from volcanoes. It rises to the surface as the hot magma is less dense than the rock in the crust. These types of eruption are usually slow.
Violent volcanic eruptions are often caused when the magma that has risen to the surface is unable to erupt from a volcano due to a particularly hard/dense layer of rock or it losing so much heat up it begins to harden and become solid rock its self. this creates pockets of magma called magma chambers. As more and more magma builds up there over time the pressure builds up and up until it is sufficient to overcome the tougher rock around it and explodes out violently all at once in a much more violent volcanic eruption.
What else can I help you with?
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 would happen if volcanic eruptions continued to occur on the sea floor?
There are volcanoes along the floor of the ocean that form a trench. When these volcanoes erupt, it can cause tectonic movements.
Do all volcanic eruptions pass through the crater at the volcanic summit?
No, not all volcanic eruptions pass through the crater at the volcanic summit. Some eruptions can occur from fissures on the sides of the volcano or even from vents located lower down on the volcano's slopes.
Does a pyroclastic flow typically occur during a quiet eruption?
No, pyroclastic flows typically occur during explosive volcanic eruptions when hot gas and volcanic particles travel rapidly down the side of the volcano. Quiet eruptions, such as lava flows, do not produce pyroclastic flows.
What are 3 types of non-volcanic types of eruption?
Phreatic eruptions occur when water comes into contact with magma, causing a steam-driven explosion. Phreatomagmatic eruptions involve the interaction of water and magma to produce explosive eruptions. Surtseyan eruptions refer to shallow submarine or coastal volcanic eruptions that interact with water or ice, creating explosive activity.
What solar events occur during volcanic eruptions?
There are no Solar events that are connected to volcanic eruptions.
Do earthquakes occur prior to volcanic eruptions?
The answer is No.
Where do volcanic eruptions occur?
Along some plate boundaries.
What natural disaters can occur in iceland?
Volcanic eruptions and earthquakes.
What 2 natural hazards do not occur in Tasmania?
Cyclones and volcanic eruptions do not occur in Tasmania.
What is likely to occur as a result of a major earthquake in the US?
Volcanic eruptions
Do volcanic eruptions only cause destruction?
No. Volcanic eruptions can build mountains and form new land. Many occur in remote areas where there is not much to destroy.
How often do lahars occur?
Lahars can occur anytime there is a volcanic eruption or when large amounts of rainfall or snowmelt mix with volcanic debris on a slope. Their frequency varies depending on the volcanic activity and local weather conditions, but they can happen during or after an eruption. Monitoring volcanic activity and having early warning systems in place are essential to mitigate their impacts.
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 would happen if volcanic eruptions continued to occur on the sea floor?
There are volcanoes along the floor of the ocean that form a trench. When these volcanoes erupt, it can cause tectonic movements.
What conditions would be necessary for an earthquake and volcanic eruptions to occur outside these zones?
unreliable
Where do lots of earthquakes and volcanic eruptions occur?
The Ring of Fire and the San Andreas Fault
