magma is an example of an intrusive igneous rock.
magma is an example of an intrusive igneous rock.
what is an example of an intrusive igneous rock?
magma
extrusive igneous rocks, also known as volcanic rocks, are formed at the crust's surface as a result of the partial melting of rocks within the mantle and crust. extrusive igneous rocks cool and solidify quicker than intrusive igneous rocks. they are formed by the cooling of molten magma on the earth's surface. the magma, which is brought to the surface through fissures or volcanic eruptions, solidifies at a faster rate. hence such rocks are smooth, crystalline and fine-grained. basalt is a common extrusive igneous rock and forms lava flows, lava sheets and lava plateaus. some kinds of basalt solidify to form long polygonal columns. the giant's causeway in antrim, northern ireland is an example.
igneous rock
the central cores of major mountain ranges consist of intrusive igneous rocks, usually granite. when exposed by erosion, these cores (called "batholiths") may occupy huge areas of the earth's surface.









































intrusive igneous rocks that form at depth within the crust are termed plutonic (or "abyssal") rocks and are usually coarse-grained. intrusive igneous rocks that form near the surface are termed "subvolcanic" or "hypabyssal" rocks and they are usually medium-grained. hypabyssal rocks are less common than plutonic or volcanic rocks and often form dikes, sills, laccoliths, lopoliths, or phacoliths.









































section::::geological setting.:extrusive.
igneous rock