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.
Copernicusâs model handled the basic observations: 1  Like the geocentric model, the earth was believed to be round. 2  The earth rotated, and thus the stars, sun, and planets appeared to move around the earth.  Mercury and Venus were closer to the sun than the earth and so always appeared near the sun.