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The molten inner mantle of the earth is under extremely high pressure, and is also extremely hot. Therefore, the reason volcanoes are created (and erupt) is because sometimes, the magma begins to go upwards (it can't go anywhere else) because of the immense pressure.
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∙ 10y ago
Wiki User
∙ 11y agoThe magma is in the mantle, the layer under the crust.
There is a convection current caused by radioactivity in the inner core which causes the plates to move.
Therefore the constructive plates move apart which means magma can rise up.
It'll then solidify and this is what makes volcanoes. Hence CONSTRUCTive.
Wiki User
∙ 9y agoThis is very complex, but the main force is gravity (the weight of the overlying rock). Then as the magma nears the surface it begins to degas and this makes the top of the magma foam and become lighter. This means the weight of the magma column is not is hydrostatic equilibrium and more rises up to compensate. At the surface the escaping gas causes explosions and even fountains of lava to form. At first thought seems a bit odd for gravity to cause something to rise.
Wiki User
∙ 13y agoThe pressure of the volcano builds up inside the underground feature (volcano) until it can't hold anymore so it BURSTS out!
Wiki User
∙ 12y agoIf Chuck Norris can change $10 into $100 then Chuck Norris can make the Magma in a Volcano erupt so that's your question.
Wiki User
∙ 14y agoPressure. The volcano or underground builds pressure and can't hold it in, so it bursts out.
Wiki User
∙ 12y agoMagma is less dense than rock and is under pressure due to this density difference. It will seek out any weaknesses in the rock above it to reach the surface
Wiki User
∙ 12y agoIt's because of the temperature and the subduction zone. The oceanic crust, which contains sediments, goes down to the mantle and melts and goes out a volcano.
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∙ 12y agoi like monkeys
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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.
Explain the sequence of events that cause the movement of the plates on the earths surface use these terms core heat mantle flow rise sideways drag cools sinks?
Magma gets heated, rises, flows horizontally (the plate over it moves with it, but not as fast as the magma), cools and sinks.
At a subduction zone what causes magma to rise?
heat and pressure of the 2 plates pushing against each other.
What causes magma to flow upward thought the earths surface?
The tectonic plates push together thus causing magma to shoot up and rise hence an eruption
When will magma rise to earths surface?
During a volcanic eruption or on a constructive boundary
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.
What causes magma to rise to earths surface?
The magma is in the mantle, the layer under the crust. There is a convection current caused by radioactivity in the inner core which causes the plates to move. Therefore the constructive plates move apart which means magma can rise up. It'll then solidify and this is what makes volcanoes. Hence CONSTRUCTive.
How does magma rise to the surface of the Earth?
Through cracks, holes or vents in the earths crust.
What causes the magma inside a volcano to rise to award the surface?
The molten magma increases in pressure (like a pressure cooker at home) until it is forced towards the surface.
What causes magma beneath the volcano to rise to the surface?
Increasing pressure pushes the magma upwards. This rising pressure can be caused by many different things.
How does magma move from a chamber deep within the earth to earths surface?
this answer has to do with density if magma becomes less dense than rock it will rise to the top ,for example vegetable oil in water.
What property of magma causes it to rise toword earth's surface?
It is less dense than its surrounding rock matter
What property of magam cause it to rise towaed earths surface?
What property of magam cause it to rise towaed earths surface?
How volcanoes occur?
Volcanoes occur when the earth cools off, and releases internal heat and pressure. Magma is a lower density than the surrounding rocks, and this causes it to rise to the surface. As it rises, gas bubbles form in the magma, exerting pressure, causing the magma to erupt out of the surface of the earth.
Where does magma mainly rise to the surface?
at volcanoes
