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Magma rises through the crust above it because of pressure and depending on the magma (Pahoehoe or Aa). Pahoehoe is thin and runny and pours outside of the crust but, Aa is think and chunky and it can not pour out of a crack in the crust. It is more likely to blow out.
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Why does magma rise through the crust above it?
Pressure builds in the magma chamber forcing it upward through faults in the crust
The opening in Earth's crust through which magma rises to the surface is known as the?
The opening in the earth crust which magma rise to the surface are Volcanoes
Why does magma in the mantle rise through the crust above it?
magma comes from the outer core and when an earthquake or something happends, a crack froms and the pressure of lava shoots up like a geyser.
How does magma rise to the surface of the Earth?
Through cracks, holes or vents in the earths crust.
Large areas which have elevated domes are formed by what?
Granite magma attempting to rise through the crust.
How does the magma get above ground?
High pressures in the Earth’s crust pushes magma up cracks in the tectonic plates until it emerges above ground level.
What causes the magma to rise and push the underside of the oceanic crust at the mid-ocean ridge?
As with most Magma uprising, it is caused by internal pressures of the Earth.
Why are igneous rock formed?
They can be formed underground or above ground. Underground, they are formed when melted rock, called magma, deep under the earth's surface is trapped in small pockets. As these pockets of magma cool slowly underground, the magma develops into igneous rocks. Igneous rocks are also formed when volcanoes erupt, causing the magma to rise above the earth's crust. When magma appears above the earth, it is called lava. Igneous rocks are formed as the lava cools above ground.
Which of the following is not true. A the heat of the crust creats magma. B the crust is 25 miles thick. C a volcanic eruption is when lava spews or oozes out of a vent. D all of above?
It is A. The heat of the crust creates magma
What causes a magma chamber to rise?
Magma rises through the crust because it is less dense than the surrounding rock, and due to the enormous pressure inside the earth.
What is an area where magma from deep within the mantle melts through the crust above?
Hot spot.
What are the geological conditions for a volcano?
For a volcano to erupt the pressure from magma beneath the surface of the earth's crust must exceed the weight of the crust above it
