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Why is granite less dense than other rocks in earths mantle?
Because its less dense
What has less density--the crustal rocks or the mantle rocks?
Crustal rock is normally less dense than mantle rock.
Magma tends to rise toward Earth's surface principally because?
Magma tends to rise towards Earth's surface primarily because rocks become less dense when they melt. The hotter the magma, the more the rocks are likely to "float," if you will.
Are rocks that are changed by metamorphism more or less dense?
More. There are more molecules in the stone after it is changed.
How are Ocean floor rocks are different from continental rocks?
Oceanic crust is composed primarily of the dense volcanic rock basalt. Continental crust is composed primarily of the intrusive igneous rock granite, less dense than basalt.
Why is granite less dense than other rocks in earths mantle?
Because its less dense
Are rocks changed by metamorphism less dense?
That depends on the rock and the type of metamorphism is underwent. Some rocks become more dense, some become less.
Light-colored igneous rocks are less what than dark-colored igneous rocks are?
less dense
What has less density--the crustal rocks or the mantle rocks?
Crustal rock is normally less dense than mantle rock.
Light colored igneous rocks are less what than dark igneous rocks?
basaltic rocks are darker because they are more dence granitic rocks are less dence so they are lighter
How does Felsic magmas different from mafic magmas in color temperate minerals composition and the kind of rock each form?
Mafic lava is less viscous(runnier) than felsic lava due to a lower silica content. This causes non-violent eruptions such as in the Hawaiian Islands. Mafic lava tends to be associated more with interplate volcanism and mid-ocean ridges and produces the rock type known as basalt. (The ocean floor is made of basalt.) Felsic lava is mainly found at convergent zones (areas of colliding plates) and has a high silica and water content which causes the lava to be highly viscous and causes very violent eruptions. This lava produces rhyolite and andesitic rocks. The color of the rocks formed by magmas is a consequence of its composition, mafic magmas are dark colored (Mg-Fe) and felsic magmas are light colored (Feldspars-Si).
Is the highest density rock mainly found in the continental crust?
No, the highest density rock is found in the oceanic crust. This is commonly enriched in higher density elements such as magnesium and iron (hence the rocks are described as Mafic) as opposed to the Felsic rocks of the continental crust which have higher proportions of the less dense elements such as silicon and oxygen.
What is the contenental crust made up of?
less dense rocks such as granite.
Why do magma's rise toward the earth's surface?
Rocks become less dense when they melt
Magma tends to rise toward Earth's surface principally because?
Magma tends to rise towards Earth's surface primarily because rocks become less dense when they melt. The hotter the magma, the more the rocks are likely to "float," if you will.
Which cools faster mafic or felsic rocks?
mafic because it is-dark colored. Ultramafic - no light colored mineral which means it it attracts most heat from a volcano taking it longer to cool down from the lighter, in between substance known as felsic :D
How is andesite different from rhyolite and basalt?
There are rocks that are extrusive (formed quickly on the surface of the earth) or intrusive (formed within the earth under slow cooling). Both types of extrusive or intrusive rocks can vary in composition from mafic (high iron and magnesium content) to silicic (less heavy ions like Fe and Mg, but with more of the lighter elements like Ca, Na, K, etc.). Extrusive rocks range from most mafic to less mafic as such: Basalt, Andesite, Rhyolite (and are all fine-grained b/c they cooled quickly). Intrusive rocks that cool more slowly and have larger crystals range from most mafic to less mafic as such: Gabbro, Diorite, Granite. Basalt and gabbro have a similar composition, just the crystal size differs from different cooling rates (same for rhyolite and granite).
