In archaeology, rock art is human-made markings placed on natural stone; it is largely synonymous with parietal art. A global phenomenon, rock art is found in many culturally diverse regions of the world. It has been produced in many contexts throughout human history, although the majority of rock art that has been ethnographically recorded has been produced as a part of ritual. Such artworks are often divided into three forms: petroglyphs, which are carved into the rock surface, pictographs, which are painted onto the surface, and earth figures, formed on the ground. The oldest known rock art dates from the Upper Palaeolithic period, having been found in Europe, Australia, Asia and Africa. Archaeologists studying these artworks believe that they likely had magico-religious significance.
Miscigenação é o processo gerado a partir da mistura entre diferentes etnias. Os seres humanos miscigenados apresentam características físicas típicas de várias "raças".
O indivíduo que nasce a partir da miscigenação étnica (que ainda pode ser chamada de mestiçagem ou caldeamento) é considerado mestiço.
Do ponto de vista mundial, a miscigenação é considerada a união entre as três principais etnias existentes no planeta: brancos, negros e amarelos (sendo que os indígenas estariam classificados neste último grupo).
