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Because the subducting plate is water saturated oceanic crust, and as it moves down into the mantle it vaporizes the water and forces steam upwards. At the same time, the descending plate causes friction and circulation, leading to pressure-release melting. All of these processes melt the upper mantle to form magma chambers and thus, volcanoes.
What else can I help you with?
Do earthquakes occur at constructive margins?
Yes, earthquakes can occur at constructive margins where tectonic plates are moving apart. As the plates separate, tension builds up in the crust which can lead to faults slipping and causing earthquakes. However, earthquakes at constructive margins tend to be less frequent and less intense compared to those at other types of plate boundaries.
Why do volcanoes occur at conservative plate margins?
after earth
What processes can be observed at the margins of lithospheric plates?
At plate margins, processes such as subduction, where one plate is forced beneath another, occur. This can lead to the formation of deep ocean trenches. Additionally, plate margins can be locations of volcanic activity and earthquakes due to the movement and interaction of the plates.
Where do volcanoes that are far from the margins of the tectonic plates appear?
These volcanoes are believed to be above local 'hot spots' on the surface. Hawaii would be the prime example. Most volcanoes occur above the subduction zones at a merging plate boundary. But volcanoes also appear directly at the expanding junction of a pair of plates. Iceland, and some of the South Atlantic islands are examples of this.
Hotspot volcanoes occur along subduction zones?
False. Hotspot volcanoes form above mantle plumes, which are localized upwellings of hot mantle material. Subduction zone volcanoes form due to the subduction of one tectonic plate beneath another, resulting in magma generation due to the melting of the subducted plate.
Do Hotspot volcanoes occur along subduction zones.?
No, hotspot volcanoes do not occur along subduction zones. They occur when plates pass over mantle hot spots.
Do earthquakes occur at constructive margins?
Yes, earthquakes can occur at constructive margins where tectonic plates are moving apart. As the plates separate, tension builds up in the crust which can lead to faults slipping and causing earthquakes. However, earthquakes at constructive margins tend to be less frequent and less intense compared to those at other types of plate boundaries.
Why do volcanoes occur at conservative plate margins?
after earth
What type of plate boundaries do stratovolcanoes occur?
At constructive plate margins (where two plate slide away from each other) or a destructive plate boundary (where two plates slide together), volcanoes do not occur at a conservative plate margin. Hope this helps
What processes can be observed at the margins of lithospheric plates?
At plate margins, processes such as subduction, where one plate is forced beneath another, occur. This can lead to the formation of deep ocean trenches. Additionally, plate margins can be locations of volcanic activity and earthquakes due to the movement and interaction of the plates.
Where do volcanoes that are far from the margins of the tectonic plates appear?
These volcanoes are believed to be above local 'hot spots' on the surface. Hawaii would be the prime example. Most volcanoes occur above the subduction zones at a merging plate boundary. But volcanoes also appear directly at the expanding junction of a pair of plates. Iceland, and some of the South Atlantic islands are examples of this.
Hotspot volcanoes occur along subduction zones?
False. Hotspot volcanoes form above mantle plumes, which are localized upwellings of hot mantle material. Subduction zone volcanoes form due to the subduction of one tectonic plate beneath another, resulting in magma generation due to the melting of the subducted plate.
Why do volcanoes occur at subduction zones?
Volcanoes occur at subduction zones because one tectonic plate is forced beneath another into the Earth's mantle. As the plate descends, the high temperature and pressure cause the crust to melt, forming magma. This magma then rises to the surface, creating volcanic activity.
How is the distribution of super volcanoes different to that of a typical volcano?
Super volcanoes are much rarer and occur at subduction zones or hotspots, while typical volcanoes are more common and found at convergent or divergent plate boundaries. Super volcanoes have the potential to release extremely large volumes of magma and ash during an eruption, on a scale much greater than typical volcanoes.
What can occur at places where one plate is pushed below another plate?
It is called subduction. Usually it will form coastal volcanoes.
Do volcanoes occur where two tectonic plates moves apart and magma rises up to create new crust?
No. Generally volcanoes occur at plate boundaries called subduction boundaries. At a subduction boundary one tectonic plate rides over another and the lower plate is forced down and magma is forced up
Do volcanoes occur at hot spots?
No. Hot spots and subduction zones are two separate geogolgic settings in which volcanoes can form. Some hot spots may develop as a result of activity in a subduction zone, and continue activity after subduction has ended or move away.
