Natura - nature
   actualia - actual entities
     Mundus Plinius - physical world
       Astra Plinius - celestial bodies
         Universe
           (Supercluster) Virgo-Hydra-Centaurus Supercluster
             (Supercluster) Virgo Supercluster
               (Cluster) Local Group
                 (Galaxy) Milky Way Galaxy veter.
                   (Spiral arm) Orion Arm
                     (Region) Local Bubble
                       Local Interstellar Cloud
                         (Planetary system) Solar System
                           (Planet-satellite system) Earth System
                             (Planet) Earth veter.
                               "spheres" (Earth)
                                 (Sphere) Cryosphere (Earth) - layer of snow and ice
                                   1.1 Arctic ice pack
                                   1.2 Greenland ice sheet
                                   2.1 Antarctic ice pack
                                   2.2.1 Filchner-Ronne Ice Shelf
                                   2.2.2 Ross Ice Shelf
                                   2.3 Antarctic ice sheet