Cryosol | Soil Monoliths Cryosols (or Gelisols in USDA Soil Taxonomy) have permafrost either within 1 m of the surface or within 2 m if the pedon is strongly cryoturbated in the active layer. Monoliths.soilweb.ca
Among the ancient Greeks, Homer thought the world to be flat. In contrast, Pythagoras postulated that the earth was round. A century later, Aristotle sided with the theory of the roundness of the earth.
The world was not discovered to be round and spherical rather than flat in any one year or any spectacular revelation. It was gradually accepted by more and more philosophers, scientists, and other intellectuals until it was eventually accepted by the populace at large when distribution of information became easier.