The barycentric subdivision subdivides each edge of the graph. Each node in an octree subdivides the space it represents into eight octants. The Myer classification subdivides macroglossia into generalized or localized. It is an analytical technique that subdivides a large subject into increasingly smaller subtopics. Environment Canada subdivides British Columbia into a system of ecozones, each containing smaller ecoregions. Systems are unrelated to lithostratigraphy, which subdivides rock layers on their lithology. "Level II" subdivides the continent into 52 smaller ecoregions. The historical/linguistic classification of verbs subdivides the verbs into 5 categories. Another definition, given by NOAA, subdivides Puget Sound into five basins or regions. But then within that, it subdivides into a further three joints. The standard subdivides AWD systems into three categories. On this basis, he subdivides the Germanic languages into High Germanic and Low Germanic. The species subdivides and offsets readily; in the wild it forms large clumps. The second subdivides and includes some countries based on cultural criteria. The USCS further subdivides the three major soil classes for clarification.