0
Magma is less dense because it is a fluid, is hot, and it is full of gases.
Ultimately a volcano is an expression of the lightest minerals in a magma, mixed with volatile gases. It is true that molten rock takes up more space than cold rock, because the ions involved are in a greater state of excitement. Heat rises, and as it rises it takes with it the molten magma, but as it rises it also loses heat, thereby dropping higher melting point minerals out of solution.
If magma is less dense than the surrounding rock it will rise, according to the physical laws of gravity. Magma finds its own level, where it is in density equilibrium with its surrounding rocks.
Fractionation can occur within the magma body, where the heavy minerals created will crystallize and sink within the body, and the lighter fluid will rise until it finds another density equilibrium.
Magma created in subduction zones generally contains more volatile gases than other knids of magma because a lot of water has been incorporated within the subducting slab as zeolites. This reduces the melting point of the magma.
Aso, from a slight;y different perspective, there is an interchange between granite and its surrounding greywacke, both are very similar in density, and in the vicinity of a felsic orogeny bits of granite can be found in greywacke, and bits of greywacke (xenoliths) can be found in granite .
What else can I help you with?
Do rocks float on mercury?
No, rocks are denser than mercury, so they would sink in mercury. Mercury is a very dense liquid at room temperature, so objects that are less dense than mercury will float on it.
Light colored igneous rocks are less what than dark igneous rocks?
Dense. Light colored igneous rocks have lower density compared to dark colored igneous rocks due to their higher silica content, which results in slower cooling and the formation of larger crystals.
Why is water located above the earths crust but below the air?
Because it is less dense than the material that makes up the earth's crust, but more dense than the material that makes up the air.
In general how does the density of a light colored igneous rock differ from that of a dark colored igneous rock?
Light-coloured igneous rocks, such as granite, have a higher silica content and lower iron and magnesium than darker ones, such as basalt. Since iron and magnesium are very dense minerals, this makes darker igneous rocks more dense than lighter ones.
What is always less dense than solids?
Gases are less dense than solids.
What has less density--the crustal rocks or the mantle rocks?
Crustal rock is normally less dense than mantle rock.
Is earths atmosphere much thinner and less dense than mercury's?
No
Light-colored igneous rocks are less what than dark-colored igneous rocks are?
less dense
Continents float on the Earth's mantle because continental rocks are 'blank' than mantle rock.?
Continental rock is less dense than mantle rock.
True or false continental crust is made of rocks such as granite?
True. Continental crust is primarily composed of lighter rocks such as granite, which are less dense than the basaltic rocks found in oceanic crust. This is why continental crust is thicker and less dense than oceanic crust.
Do rocks float on mercury?
No, rocks are denser than mercury, so they would sink in mercury. Mercury is a very dense liquid at room temperature, so objects that are less dense than mercury will float on it.
Why is granite less dense than other rocks in earths mantle?
Because its less dense
Light colored igneous rocks are less what than dark igneous rocks?
Dense. Light colored igneous rocks have lower density compared to dark colored igneous rocks due to their higher silica content, which results in slower cooling and the formation of larger crystals.
Why is water located above the earths crust but below the air?
Because it is less dense than the material that makes up the earth's crust, but more dense than the material that makes up the air.
In general how does the density of a light colored igneous rock differ from that of a dark colored igneous rock?
Light-coloured igneous rocks, such as granite, have a higher silica content and lower iron and magnesium than darker ones, such as basalt. Since iron and magnesium are very dense minerals, this makes darker igneous rocks more dense than lighter ones.
What percent of the earths mass is water?
Approximately 71% of Earth's surface is covered by water, but only about 0.02% of Earth's total mass is water. This is because water is less dense than the rocks that make up the Earth's interior.
Would it be easier for a plane to fly higher in an atmosphere less dense than Earths?
i No, ;it would be easier in denser air. Less dense air gives nothing for the wings of the plane to use to propel itself upwards. Less dense air would make the plane crash.
