How do extrusive igneous rocks differ from intrusive igneous rocks?

The intrusive and extrusive rocks differ in the manner in which they have formed, their density, coloration, grains, etc.

Explanation:

The intrusive and extrusive igneous rocks are the two wide branches of igneous rocks. While they do share multiple similarities, they also have multiple differences, which makes it relatively easy to distinguish them from one another. The differences can be seen in the location of their formation, the size of the grains, their coloration, density, the manner in which they have been formed... Notable differences between these two subgroups of rocks are:

Intrusive: Inside the Earth, plutonic, formed from magma, dark, dense, mafic, cooled off slowly, and large grains.

Extrusive: Outside the Earth, volcanic, formed from lava, light-colored, low density, felsic, cooled off quickly, and small or no grains.