Inventory is a type of Register. Inventory is a type of Document. Currency is a type of Document. 
you are likely to find Pollution in/at/on Outside. Outside is related to Nature. Nature is related to Scientific. 
Register <--IsA-- Inventory --IsA--> Document <--IsA-- Currency 
Pollution --AtLocation--> Outside <--RelatedTo--> Nature <--RelatedTo--> Scientific 