Full Definition of SITE. 1. a: the spatial location of an actual or planned structure or set of structures (as a building, town, or monuments) b: a space of ground occupied or to be occupied by a building.
Long story short - continental crust is thicker because is less dense, and it is less dense because it's composed mostly of quartz and feldspars, both having density around 2.6 g/cm3, whereas oceanic crust is made up by slightly denser Ca feldspar called plagioclase as well as pyroxenes and olivine, both having density above 3 g/dm3.
Continental Lithosphere. Continental lithosphere is thicker than seafloor lithosphere, and the crust layer of it has a different chemical composition. The increased thickness is due to the fact that the rocks of the continental crust have been stacked up due to plate collisions over long periods of time.