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Why does lava stay underground before erupting?
because that is where the massive chambers full of magma are the pressure of the magma keeps building up under the crust till it cant take it any more and it erupts :)
What is rock that floats called?
Rocks float when their density is lower than that of the surrounding medium. E.g. in water, pumice floats; in an alkaline magma, felspathoids might float; in a basaltic magma, plagioclase would float at pressures greater than about 5kbar (! feldspathoids and plagioclase aren't rocks, these are minerals).
Is magma more dense then rock?
No. Magma varies in density, but it will be less dense than a solid rock of the same composition.
What would cause a metamorphic rock to surround magma?
If the magma intruded into some other rock, its heat and pressure would tend to metamorphose the surrounding rock near to it, producing a body of magma surrounded by metamorphic rock.
What happens if the magma has the same density as the rock around it?
It contracts:)
Does magma erode igneous rocks inside a volcano?
In a way. A magma is hotter then the surrounding rock, that's why the magma is molten and the rock is not. But because of this, some heat of the magma is melting the surrounding rock. You might want to classify this as erosion, but it's simply the melting of the rock surrounding the magma.
Mafic mineral low or high density?
Mafic magma and rock are higher in density that felsic magma and rock.
Why might molten rock rise and sink beneath the earths surface?
changes in buoyancy due to changes in density differences between the magma and surrounding rock.
What is magma sill?
A magma sill is a planar sheet of magma which is parallel to the surrounding rock.
Why does lava stay underground before erupting?
because that is where the massive chambers full of magma are the pressure of the magma keeps building up under the crust till it cant take it any more and it erupts :)
Is magma less dense then the surrounding rock?
yes
What is rock that floats called?
Rocks float when their density is lower than that of the surrounding medium. E.g. in water, pumice floats; in an alkaline magma, felspathoids might float; in a basaltic magma, plagioclase would float at pressures greater than about 5kbar (! feldspathoids and plagioclase aren't rocks, these are minerals).
Can the interaction between magma and surrounding rock cause changes in the rock?
Yes. The rock will get hot, of course, and some pieces of rock will become magma itself.
How is the igneous rock changed to sedimentary rock?
Sedimentary rock goes deep in the Earth and reaches magma. It then melts and becomes part of the magma. Since the newly formed magma is less dense than the surrounding rock it is lighter than the surrounding rock and it goes up and cools. It then becomes an Igneous rock.
Is magma more dense then rock?
No. Magma varies in density, but it will be less dense than a solid rock of the same composition.
Why does magma come to the surface?
Magma is less dense than the surrounding rock; as such, it will rise toward the surface.
What would cause a metamorphic rock to surround magma?
If the magma intruded into some other rock, its heat and pressure would tend to metamorphose the surrounding rock near to it, producing a body of magma surrounded by metamorphic rock.
