The Major Rock ClassesIgneous Rocks1.Briefly explain the difference between intrusive and extrusive rocks (cools slowly/quickly, small/large grains, fine/coarse texture, more/less dense –Note: these are the characteristics to use).(4 pts)Intrusive:Extrusive:2.These differences are related to wherethe rocks cool and solidify. In general terms, intrusive rocks cool, while extrusive rocks cool .(2 pts)3.What types of processes produce igneous rocks?(1 pt)4.What is the dominant factor that determines the grain size in igneous rocks?(1 pt)