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The first sort of plate boundary is called a divergent boundary, or spreading center. At these boundaries, two plates move away from one another. As the two move apart, mid-ocean ridges are created as magma from the mantle up wells through a crack in the oceanic crust and cools. This, in turn, causes the growth of oceanic crust on either side of the vents. As the plates continue to move, and more crust is formed, the ocean basin expands and a ridge system is created. Divergent boundaries are responsible in part for driving the motion of the plates.
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LaoMagma forms at convergent plate boundaries due to subduction, where one tectonic plate is forced beneath another. The downward plate reaches high temperatures and pressures, causing it to partially melt and form magma. This magma can then rise to the surface and result in volcanic activity.
Magma is generated along the convergent plate boundaries as slab sinks into the mantle and, the increased temperature and pressure drives volatiles from the oceanic crust. These mobile fluids migrate upward into the wedge-shaped piece of mantle located between the sub ducting slab and overriding plate. Once the sinking slab reaches a depth of 100 km, these water rich fluids reduce the melting point of hot mantle rock sufficiently triggering some melting. And these partial melting of the mantle is what generates magma.
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How does a volcano erupt at a convergent boundary?
At a convergent boundary, magma from the subducting oceanic plate rises due to the intense heat and pressure. As the magma rises, it can cause explosive eruptions due to the high gas content and pressure buildup. This can result in the formation of explosive stratovolcanoes along the convergent boundary.
Is Krakatoa a divergent convergent or transform boundary?
Krakatoa is located at a convergent boundary, where the Indo-Australian Plate is being subducted beneath the Eurasian Plate. This subduction zone can lead to intense volcanic activity due to the melting and rising of magma from the subducted plate.
Is mt hood made by convergent divergent or transform boundaries?
Mount Hood is formed by a convergent boundary where the Juan de Fuca tectonic plate is being subducted beneath the North American plate. This subduction causes magma to rise and create the volcanic activity that forms Mount Hood.
What type of plate boundary triggers the formation of active volcanoes as magma rises beneath the surface?
A convergent plate boundary where one plate subducts beneath another is the type of plate boundary that triggers the formation of active volcanoes. The subducted plate melts and forms magma, which rises to the surface and causes volcanic activity.
What Type of plate boundary exists between Indian and Asia?
A Collision plate boundary, where two continental plates that are the same in density and thickness, push against each other forming fold mountains and crumble zones. This causes Earthquakes from the pressure and stress but not volcanoes.
