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Not all of them are coarse grained, however, in general when magma is intruded into other rocks rather then being extruded onto the earth's surface and cooling in air or water, it cools down more slowly. This slow cooling allows time for crystals to grow and this makes the rocks coarse grained.

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Q: Why are intrusive rocks coarse grained?
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Related questions

Which rocks are more likely to have a coarse grained extrusive or intrusive?

extrusive


What do Granite and diorite have in common?

They are both coarse-grained intrusive igneous rocks


What do granite and gabbro have in common?

They are both coarse grained intrusive igneous rocks


Intrusive Igneous rocks are characterized by a coarse-grained texture because they contain?

Intrusive igneous rocks commonly have large mineral crystals.


What is the texture of an intrusive rock?

It is a coarse grained rock if its intrusive.


What is the texture of intrusive rock?

It is a coarse grained rock if its intrusive.


Why does the Intrusive rock usually have a coarse grained texture?

classified


What coarse grained intrusive rock is used for buildings and monuments?

granite


What characteristics are used to classify igneous rocks?

Intrusive and extrusive factors of an igneous rock classify them. The other factors are if they are vesicular, coarse, fine grained, glassy, or very coarse


Do metamorphic rock and igneous rock have fine grained and coarse grained?

Yes. Exactly, they do have both, fine grained and coarse grained rocks.


What are the types of volcanic rocks?

Igneous rocks exhibit three types of textures: coarse grained (intrusive), fine grained (extrusive), and porphyritic (two-stage solidification of mineral constituents). Chemically, they are categorized as felsic, mafic, or intermediate.


Describe granite using the three characteristics geologists use to classify igneous rocks?

Granite is a felsic, coarse grained, intrusive igneous rock.