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Interior pressure of the forces the magma through the crack. This upwelling of magma then rapidly cools and becomes brittle as it hardens. The pressure of the subsurface magma then breaks this brittle rock and forces more magma up in a continuous cycle.
Wiki User
∙ 13y ago
Wiki User
∙ 12y agoBecause the plates are near the crust of the earth and the magma is in the mantle which is underneath and trying to get out. So when a gap appears, all the magma squeezes and tries to get out, sometimes this causes a volcano. So it appears wherever the plates touch each other. Look on Google images for a image of the plates. They appear on plate boundaries
:)
Wiki User
∙ 14y agoIt either comes up where two plates move apart. Or where one goes under the other, melts, then rises in a volcano. Or in a hot spot like Hawaii
Wiki User
∙ 12y agoHeat rises, and magma it hot.
Magma also 'falls' when it cools.
Wiki User
∙ 11y agomagma rises because of convection currents. your welcome.
Wiki User
∙ 11y agoBecause it's under immense pressure. When a crack or fissure appears in the crust, the molten magma is forced to the surface by the pressure underground.
Wiki User
∙ 7y agoLower pressure below cracks.
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What are the examples of divergent boundary?
Examples of a divergent boundary would be a mid-ocean ridge. Two plates are pulling apart from each other. If you have heard before, the magma from the asthenosphere find a way to get out through the crack of the diverging plates and makes new land. Another type of devergent boundary would be a fissure. It is a long linear crack made by the plates moving apart. I think maybe another one would probably be a volcano, but I am not sure.
What exerts a strong pull on water in the ocean?
The Moon's gravitational pull on our planet causes the ebb and flow, (rise and fall), of our earth's oceans.
Does gravity play a role in plate movement?
From what I know, Geologists have two main theories on why plates move. -The First idea is that at converging plate margins (constructive) as material moves up, the plates are pushed outwards -The second idea is that convection currents within the asthenosphere, (below the plates) which push plates along as if they were on wheels. These currents are formed as partially melted rocks rise because they are heated because it is hotter closer to the core and hotter materials rise. However, after rising for a while, the material cools and drops down again. This forms circular movements of rock which push the plates along. According to these theories, gravity doesn't but there might be another theory which says otherwise.
Why are mountains constructive?
Mountains form at (convergent and divergent) plate boundaries. Two plates can crash together and bend upward, forming a mountain, or lava can harden into rack and build up volcanoes which are mountains.
What does Gravity have to do with hot air rising?
The density of air changes with change of temperature, therefore changing it's mass. In other words, the molecules that make up the composition of air move farther apart with a rise in temp and, of course, just the opposite with a decrease in temp. Since temperature changes the mass of air, gravitational pull from the earth will change proportionately.
What must happen first before magma rise to the surface?
Earth plates MUST pull apart.
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 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.
What cause seafloor spreading?
valconoes!
What does conservative plate boundary mean?
a constructive plate boundary is where two plates move apart from eachother forming a gap which allows magma to rise and that leads to a earthquake.
What does the plate boundary conservative mean?
a constructive plate boundary is where two plates move apart from eachother forming a gap which allows magma to rise and that leads to a earthquake.
Why does floor spreading occur?
Because of plate tectonics. Because it's 2 plates underwater that are moving apart. Magma rise up to where the 2 plates are separating to fill in the gap. Seafloor spreading occurs underwater.
Why do most earthquakes and volcanoes happen at plate boundaries?
When tectonic plates move against each other, it can form mountains on the surface of the earth. When the plates pull apart again, the hot molten magma from inside of the earth rise to the surface and fill up a 'magma chamber' inside of the mountain, resulting in a volcano. And as for earthquakes, when plates run against each other, it causes shakes and quakes resulting in earthquakes above the ground. Hope this helps :P
How do valcanoes form at divergent plate boundaries?
Beneath the Earth's crust is a lot of magma. Thus as the plates pull apart, it leaves a gap through which the magma can travel and erupt as lava. For example at the Mid Atlantic Ridge, there are divergent plate boundaries. The 'gap' between the divorcing plates allows magma to boil through, building up the ridge in the process.
Where might magma rise to earth surface?
Near the tech-tonic plates of the earth.
What could rise up through the gaps between the plates?
molten rock or magma
How do tectonics form rocks?
Tectonics, which refers to the movement and interactions of large plates in the Earth's crust, can form rocks through several processes. When tectonic plates collide, they can create intense pressure and heat, causing metamorphic rocks to form. When plates separate, magma can rise to the surface and cool, solidifying into igneous rocks. Additionally, when plates slide past each other, they can cause rocks to fracture and form faults.
