Geographic knowledge makes me feel superior

My parents are redoing the counters in their kitchen. They used to be some kind of laminated wood or something and they were getting worn down and full of cuts from wayward knives. Since they've been watching a lot of HGTV and lusting after the counters tops on "House Hunters," they've decided that the best course of action is to get granite counter tops. The upside of this, other than no longer having to stare at the cheap looking dark green counters that used to be in the kitchen, is that I got to feel really smart and exceedingly superior when I told them that granite was a "felsic rock." A felsic rock is a sub-category of Igneous rock. Felsic refers to the composition of an Igneous rock. A felsic rock is less dense than it's counterpart, mafic. It is also colored more lightly, has a higher viscosity, and is found in the continental crust, whereas a mafic rock is found in the oceanic crust. I was also obliged to tell them that granite is an "intrusive" rock as well. An intrusive rock is a subset of Igneous rock that tells us that the rock was formed within the earth's crust and it was cooled below the surface of the earth. An intrusive rock is formed from Magma, which is Lava that has not yet reached the earth's surface, and it has a rougher texture and larger crystals. If you look at granite in a counter top, although by the time it's there it's smooth and shiny, there are large spots of different colored crystals. These large crystals are a defining characteristic of intrusive rocks. Extrusive rocks, which are rocks that are formed and cooled on top of the surface of the earth, are formed from Lava, which is Magma that has reached the earth's surface. Extrusive rocks cool faster since they're cooling above the earth's surface and therefore have a finer texture and smaller crystals.

Granite is an extrusive, felsic, Igneous rock. I feel smart just typing it out...