As we still know, earth’s solid part is composed of rocks although the earth’s surface observation is hindered by vegetation that covers it. Consequently, it is necessary to look for places where rock has no vegetation to study it. These kinds of places where rock can be observed properly are called outcrops.
Outcrops can be natural, when they are formed as a consequence of river or sea erosion so we can distinguish its materials and a cross section in the landscape.
However, outcrops more frequently seen are those who are artificial, as a result of human action. These are cross sections formed when building roads, railroads or as a consequence of mine exploitations such as stone quarries.
