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What causes magma to form at convergent boundaries?
the mid ocean ridges cause the magma to form at a convergent plate boundary.
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 a volcano erupt at a convergent boundary?
As an oceanic plate sinks into the mantle at a convergent boundary it causes rocks to melt. Some of the newly formed magma will migrate upward to volcanoes, that have formed along the convergent boundaries, and erupt.
What causes magma to form at a convergent boundary?
the mid ocean ridges cause the magma to form at a convergent plate boundary.
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.
What causes Magma to form a convergent plate boundary?
the mid ocean ridges cause the magma to form at a convergent plate boundary.
What role does asthenosphere play in generating magma at a convergent boundary?
At an oceanic subduction zone, the athenosphere is subducted under continental lithosphere, or under other oceanic lithosphere. Friction between these plates causes heat that creates magmas. At a divergent boundary upwelling mantle (athenosphere) decompresses due to reduced pressures, allowing magma to form. This magma is extruded onto the seafloor as pillow basalts, and beneath the seafloors as massive gabbros and sheeted (gabbro) dikes.
What can be produced at an ocean-continental convergent boundary?
Ocean-continental convergent boundaries can produce earthquakes and volcanic activity. As the ocean plates shift under each other they near their melting temperature and can form magma and solidify to form underwater mountain ranges.
Mafic magma is generated at divergent boundaries because of?
decompression melting
Why do volcanoes often occur at convergent plate boundaries?
Because that is where thee is most magma exerting force
What are large rising bodies of magma not at plate boundaries called?
A large rising body of magma is called a magma plume they originate from the mantle. Plate boundaries are found at the edge of the lithospheric plates and are of three types, convergent, divergent and conservative.
Why is the lava mostly mafic at divergent plate boundaries and intermediate and felsic at convergent plate boundaries?
Mafic magma has extremely high ferromagnesian content, produced by decompression melting. As the plates move apart, mantle rises to fill the void. As it melts, it forms mafic magma. Where plates are meeting, the compression of crust forms magma with higher silica content, thus forming felsic and intermediate magmas.
