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" ... Rocks and minerals are not even evenly distributed on the surface. Igneous rocks make up approximately 95% of the upper 10 miles of earth's crust. Rocks with light minerals, like granite, make up most of the continents. Rocks with dark minerals, like gabbro and its volcanic variety basalt, make up the oceanic crust, covering two thirds of earth. Every year along the mid-ocean ridges 0.5-0.7 cubic miles of new igneous rocks form. Sedimentary rocks cover approximately 80% of earth's land surface, but their total contribution to the crust is estimated to be just about 5%. ... "