Roof is part of Bus. you are likely to find Cat in/at/on Roof. you are likely to find Cat in/at/on Jungle. Jungle is a type of Location. 
Natural is related to Coal. Coal is related to Stone. Rock is a type of Stone. Rock is related to Salt. 
Bus <--PartOf-- Roof <--AtLocation-- Cat --AtLocation--> Jungle --IsA--> Location 
Natural <--RelatedTo--> Coal <--RelatedTo--> Stone <--IsA-- Rock <--RelatedTo--> Salt 