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It seems like a pretty simple question when you first pose it, so let's look into the answer, shall we. The simplest answer would seem to be that magma, being less dense than the rock surrounding it, tries to float to the surface. If the magma contains water and dissolved gasses, when the magma reaches the surface the water and dissolved gasses will suddenly expand into steam and gas, causing a violent eruption. There are several factors that will trigger a volcanic eruption, but three predominate: the buoyancy of the magma, the pressure from the exsolved gases in the magma and the injection of a new batch of magma into an already filled magma chamber.
When rock inside the Earth melts, its mass remains the same, but its volume increases, producing magma that is less dense than the surrounding rock. This lighter magma rises toward the surface because of its buoyancy. When the density of the magma between the zone of its generation and the surface is less than that of the surrounding and overlying rocks, the will magma reach the surface and erupt.
Wiki User
∙ 11y ago
Wiki User
∙ 10y agoIt is not an answer
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What is volcanic erosion?
Volcanic Deposition is what I have the volcanoe erupts spreading lava as it cools down it forms rocks.
How does magma that hardens beneath the surface create land forms?
It creates it because when a volcano erupts, it releases lave and magma which will eventually cool, dry and harden, which creates a volcanic island.
A mountain that forms when layers of lava and ash erupt and build up is a what?
what is mountain formed from layers of lava and ash
What is an eruption cloud?
an eruption cloud is a cloud of ash that forms when a volcano erupts
What is tephra?
Tephra is produced naturally by volcanic eruptions and refers to the material produced when the volcano erupts. Tephra comes in a range of forms and are classified by size Ash, Lapilli or Volcanic blocks.
How do a volcano erupts and forms a volcanic mountain?
no no no nobody cares
What crater forms when a volcano erupts?
A divergent
When a volcano erupts quietly what kind of mountains forms?
a shield volcano
What is volcanic erosion?
Volcanic Deposition is what I have the volcanoe erupts spreading lava as it cools down it forms rocks.
When a volcano erupts and forms new land does old land disappear?
No
What does a volcanic crater form?
It forms by volcanic activity in the vent of a volcano.
How does magma that hardens beneath the surface create land forms?
It creates it because when a volcano erupts, it releases lave and magma which will eventually cool, dry and harden, which creates a volcanic island.
A mountain that forms when layers of lava and ash erupt and build up is a what?
what is mountain formed from layers of lava and ash
How does volcanic ash form?
Volcanic ash forms as a result of gas trapped in magma. As the magma approaches the surface and pressure drops, the gas is released and expands violently. The explosion blasts the magma into small particles, which become volcanic ash.
What is an eruption cloud?
an eruption cloud is a cloud of ash that forms when a volcano erupts
How can rock form when a volcano erupts?
The rock forms over a cooling process.
What is the opening around which a volcano forms?
A volcanic vent.
