Question

Why are intrusive igneous rocks usually coarse-grained.

Answer 1

Answer:

I don't know dear but I have option you can Google it you will easily get the answer

Answer 2

Answer:

Intrusive or plutonic rocks crystallize from magma beneath the earth's surface. ... The texture of an igneous rock (fine-grained vs coarse-grained) is dependent on the rate of cooling of the melt: slow cooling allows large crystals to form, fast cooling yields small crystals