These three types of rocks make up the crust.

This is especially seen in sedimentary rocks, which are respectively the dominant form of the seabed and all the great lakes, were deposited mostly in the form completely horizontal or approximately horizontal layers. Meanwhile, it is known that at great length the earth's surface layers have not kept this initial position: they are either inclined at an angle known, or have a vertical position, or, finally, twisted or bent in various ways. It is obvious that at a later time there were mass movements, which are produced in most cases, these violations, twisted seams and lifted them. These mass movements are now considered as a consequence of reduction of land under its cooling. Such violations are correctly positioned layers are observed not only in some areas: "orogenic forces" act in the same general outline for a considerable length, this is due to the origin of entire mountain ranges of the homogeneous structure: in them, regardless of the existence of some local secondary phenomena, we can trace the same location of the dominant tectonic lines.