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Granite is very much less dense than basalt. This is why the continental crust (mostly composed of granite) floats on Oceanic crust (made mostly of basalt). Granite is 70 % silicon. Where basalt is mainly pyroxene.

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Why are granitic igneous rocks light in color?

granitic igneous rocks are light colored because of a lower density than basaltic rocks


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 are andesitic and granitic rocks confined to the continents and ocean margins but absent from deep ocean basins?

The igneous rock underlying the deep ocean basins is basaltic, as its source material comes from the asthenosphere. Andesitic igneous rock is formed at colliding plate margins, where subducting oceanic crust is partially melted and undergoes differentiation as it rises through the continental crust. Granitic rock is less dense than oceanic crust and composes the continents.


Why are granitic magmas thicker than basaltic magmas?

Granitic magmas are thicker than basaltic magmas because they have higher silica content, which increases viscosity. The higher silica content leads to stronger bonding between the silica tetrahedra, making it more difficult for the magma to flow. Basaltic magmas, on the other hand, have lower silica content and are less viscous, allowing them to flow more easily.


Does Light-colored rocks with lower densities form from basaltic magma?

Basaltic Magmas are dark colored, heavy and are ferromagnesian in composition, so they most times do not form light colored rocks, rather, the Felsic Granitic Magma forms the light colored rocks with lower densities.

Related Questions

Why are granitic igneous rocks light in color?

granitic igneous rocks are light colored because of a lower density than basaltic rocks


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.


Light-colored igneous rocks with a lower density than basaltic rocks?

Felsic rocks like granite are light-colored igneous rocks with a lower density than basaltic rocks due to their silica-rich composition. Their lower density is a result of having a higher proportion of quartz and feldspar minerals, which are lighter than the minerals found in basalt.


Why are andesitic and granitic rocks confined to the continents and ocean margins but absent from deep ocean basins?

The igneous rock underlying the deep ocean basins is basaltic, as its source material comes from the asthenosphere. Andesitic igneous rock is formed at colliding plate margins, where subducting oceanic crust is partially melted and undergoes differentiation as it rises through the continental crust. Granitic rock is less dense than oceanic crust and composes the continents.


Why are granitic magmas thicker than basaltic magmas?

Granitic magmas are thicker than basaltic magmas because they have higher silica content, which increases viscosity. The higher silica content leads to stronger bonding between the silica tetrahedra, making it more difficult for the magma to flow. Basaltic magmas, on the other hand, have lower silica content and are less viscous, allowing them to flow more easily.


Three of the four layers of this part of this crust are igneous material.?

Oceanic Crust


Does Light-colored rocks with lower densities form from basaltic magma?

Basaltic Magmas are dark colored, heavy and are ferromagnesian in composition, so they most times do not form light colored rocks, rather, the Felsic Granitic Magma forms the light colored rocks with lower densities.


Are light-colored rocks with lower densities form from basaltic magma?

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What igneous rock is light colored and has a lower density?

Shutup! Jew!


What is density of the continental plate?

The density of continental plates typically ranges from about 2.5 to 3.0 grams per cubic centimeter (g/cm³). This density is primarily due to the composition of the rocks that make up the continental crust, which is primarily granitic and less dense than the basaltic rocks of oceanic plates. The lower density of continental plates contributes to their buoyancy, allowing them to "float" higher on the mantle compared to denser oceanic plates.


What type of magma is closer to intrusive rocks?

magma can be classified into two,magma of granitic composition(originates from lower continental crust) and magma of basaltic composition (which originates from upper mantle).Both can form intrusive rocks.


How would you compare and contrast basaltic and granitic magmas?

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