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Magma is more buoyant than lithospheric rock, and as such it will push toward the surface. On the continents, magma in intrusions can follow weaknesses in the crustal rock to reach the surface, or in some cases, simply melt its way through from the heat delivered by the intrusion. At divergent plate boundaries, where the lithospheric plates are pulling apart, hot rock from the mantle rises and melts from decompression melting, filling the space left from the parting plates. At so-called hotspots, such as the Hawaiian volcanic mountain chain, magma plumes are thought to rise up from the mantle-core boundary and burn through the moving lithospheric plates, creating first submarine volcanoes, then islands.
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∙ 14y ago
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∙ 12y agoThe magma is under pressure from the surround unmelted rocks due to differences in densities. This pressure forces the magma up through preexisting cracks in the rocks. In many cases though there are no preexisting cracks for the magma to move through. When this happens, if the pressure is greater the the force need to break the rock then the magma will make new cracks and contuie to rise. If the pressure is not great enough then the magma will stop rising and pond to form sills or magma chambers until it completely crystallizes or has enough pressure to rise.
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∙ 11y agolittle elfs in the earths core have hydraulics pushing the magma to the surface
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∙ 15y agoMagma is less dense than the material which surrounds it.
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∙ 13y agomagma rises through the lithosphere by when a volcano erupts the gases dissolved in magma rush out carrying the magma with them.
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∙ 12y agoMagma was once in the sea when there was seafloor spreading so it could be the sea or volcanos.
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∙ 15y agodissolved gas under pressure
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Magma tends to rise toward earths surface?
Yes, magma tends to rise towards the earth's surface. It does so because once melted it becomes less dense.
Why does Magma tends to rise toward the Earth's surface?
Magma rises from the asthenosphere to the surface of the Earth. After it reaches temperature upward to 1000 degrees Fahrenheit, the magma starts to rise. Gases also aid in pushing the magma toward the surface, along with the tremendous pressure from the depth at which it originates.
Magma tends to rise toward Earth's surface principally because?
Magma tends to rise towards Earth's surface primarily because rocks become less dense when they melt. The hotter the magma, the more the rocks are likely to "float," if you will.
Large areas which have elevated domes are formed by what?
Granite magma attempting to rise through the crust.
At a subduction zone what causes magma to rise?
heat and pressure of the 2 plates pushing against each other.
How does the magma rise from the volcano?
magma rises up out of a volcano by the build up of pressure
Does heated magma rise or sink?
When magma is being heated it rises. When it is cooled, it sinks.
Where does magma mainly rise to the surface?
at volcanoes
Does liquid magma rise until reaches the surface?
liquid magma is dangerous and tastes bad
How does andesitic rise to the surface?
magma rises and cools
Why does magma come to the surface?
Magma is less dense than the surrounding rock; as such, it will rise toward the surface.
Magma tends to rise toward earths surface?
Yes, magma tends to rise towards the earth's surface. It does so because once melted it becomes less dense.
Why does Magma tends to rise toward the Earth's surface?
Magma rises from the asthenosphere to the surface of the Earth. After it reaches temperature upward to 1000 degrees Fahrenheit, the magma starts to rise. Gases also aid in pushing the magma toward the surface, along with the tremendous pressure from the depth at which it originates.
What makes the magma im the chamber rise?
Because of the asthenosphere.
Does liquid magma rise until it reaches the surface?
yes. it goes upward through a 'pipe' that connects to the magma chamber.
Why does magma in a volcano rise up to Earth's surface?
Magma rises because it is less dense than the rock around it.
Why does magma from deep inside Earth rise toward the surface?
cuz
