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What causes the rock in the mantle at divergent boundaries to melt?
Wiki User
∙ 8y ago
The crust stretches and gets thinner so the pressure decreases on the mantle rocks below this causes part of the mantle to melt
Janelle Nader
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What causes the rocks in the mantle at divergent boundaries to melt?
The crust stretches and gets thinner so the pressure decreases on the mantle rocks below this causes part of the mantle to melt
How does magma form ay divergent boundaries?
Hot mantle rock rises to fill rift zones. When rock rises, a decrease in pressure causes hot mantle rock to melt and form magma.
Why are most volcanoes located near a fault?
Most volcanoes form at either convergent or divergent plate boundaries. Volcanoes at convergent plate boundaries form when one plate slides under another, taking seawater with it. This causes the rock in the mantle to melt as the melting point drops. This new magma can rise to form volcanoes.At divergent plate boundaries the crust is thing, which lowers pressure on the mantle, causing some material to melt.
How does magma form at convergent and divergent boundaries?
At divergent boundaries, two plates move apart from each other and the space that this creates is filled with new crustal material sourced from molten magma that forms below.
What causes magma to form at a divergant plate?
At a divergent plate boundary the crust is thin. This reduces pressure on the upper mantle, lowering the melting point and allowing some rock to melt.
What causes the rocks in the mantle at divergent boundaries to melt?
The crust stretches and gets thinner so the pressure decreases on the mantle rocks below this causes part of the mantle to melt
How does magma form ay divergent boundaries?
Hot mantle rock rises to fill rift zones. When rock rises, a decrease in pressure causes hot mantle rock to melt and form magma.
Why are most volcanoes located near a fault?
Most volcanoes form at either convergent or divergent plate boundaries. Volcanoes at convergent plate boundaries form when one plate slides under another, taking seawater with it. This causes the rock in the mantle to melt as the melting point drops. This new magma can rise to form volcanoes.At divergent plate boundaries the crust is thing, which lowers pressure on the mantle, causing some material to melt.
Why do you find volcanoes at convergent and divergent boundaries but not at transform boundaries?
Convergent and divergent boundaries melt rock in the upper mantle while transform boundaries do not. Convergent boundaries that involve at least one oceanic plate form subduction zones, where an oceanic plate plunges into the mantle. Volatiles carried into the mantle lower the melting point of the rock there, allowing magma to form.At divergent boundaries the crust becomes thinner. This reduces pressure on the upper mantle, thus lowering melting points and generating magma.Transform boundaries have no such means of producing magma.
How does magma form at convergent and divergent boundaries?
At divergent boundaries, two plates move apart from each other and the space that this creates is filled with new crustal material sourced from molten magma that forms below.
Why do earthquakes and volcanoes usually occur at plate boundaries?
Earthquake occur because tectonic plates are grinding against each other, causing movement along faults which in turn causes earthquakes. Volcanic activity occurs at subduction zones because the subducting plate introduces water into the mantle, which allows mantle rock to melt. Volcanoes form at divergent boundaries because the thinned crust reduces pressure on the upper mantle, allowing rock to melt.
What causes magma to form a divergent plate boundary?
At a divergent plate boundary the crust is thin. This reduces pressure on the upper mantle, lowering the melting point and allowing some rock to melt.
What causes magma to form at a divergant plate?
At a divergent plate boundary the crust is thin. This reduces pressure on the upper mantle, lowering the melting point and allowing some rock to melt.
How do convergent boundaries add material to earths surface?
At convergent boundaries some mantle material can melt and rise through the crust, forming volcanoes.
What causes magma to form at a convergent plate boundary?
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.
Why do so many of volcanoes occur along plate boundaries?
The mechanisms which create volcanism depend on the kind of plate boundary. At divergent plate boundaries, where plates pull apart, the crust is thin. This reduces pressure on the upper mantle, and the decompression of hot rock allows some rock to melt. This magma then rises up to form volcanoes. At convergent plate boundaries that involve oceanic crust, the more dense oceanic crust is pulled by gravity into the mantle in a process called subduction. The subducting plate will carry water and other volatile (easily vaporized) substances with it. This causes rock in the mantle to melt and rise up. There is also some evidence that this subduction causes convection currents that bring up extra hot material from deep within the mantle. As it rises closer to the surface, this hotter rock partially melts. The resulting magma can the rise to the surface to produce volcanoes.
Why are basalts produced on divergent plate boundaries?
As the plates diverge, upper mantle rock rises and undergoes decompression melting along the rift. Because the upper mantle is comprised of mafic rock, the subsequent melt of this rock produces a mafic magma. Basalt and its coarse-grained intrusive twin, gabbro, are produced when this mafic magma solidifies.
