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 simplest and most convincing proof that the Earth's is round is to examine a photo of our planet taken from space or to orbit it in the space shuttle. There can be no doubt from such evidence that the Earth is round, or more correctly, a sphere.. The word round refers to a circular shape, like the shape of a quarter when held flat in your hand. The proper term to describe the Earth's shape is spherical. A sphere appears round when viewed from any direction in space. It's okay to use the term round to refer to the shape of the Earth, so long as you're aware of this distinction.