This group collects the 31 Physical Processes subcategory members that the atlas already places under its own Biogeochemical and Pedological Processes subcategory, the whole real-world population the atlas covers there. It is a single flat group, not split further by region or country, because Biogeochemical and Pedological Processes stays well under the atlas's own hundred-member threshold for a further split. It sits directly under the Biogeochemical and Pedological Processes subcategory and under the atlas's own Groups category, giving a reader a direct browse path from either the Biogeochemical and Pedological Processes subcategory page or the Groups index.