you are likely to find Sofa in/at/on Home. Home is related to Residential. Residential is related to Street. you are likely to find Pollution in/at/on Street. 
Ground is related to Drop. Drop is related to Molecule. 
Sofa --AtLocation--> Home <--RelatedTo--> Residential <--RelatedTo--> Street <--AtLocation-- Pollution 
Ground <--RelatedTo--> Drop <--RelatedTo--> Molecule 