you are likely to find Pollution in/at/on Ocean. Ocean is related to Boat. Boat is related to Ship. 
Sheer is related to Slip. Slip is related to Toy. Toy is related to One. One is related to Foot. 
Pollution --AtLocation--> Ocean <--RelatedTo--> Boat <--RelatedTo--> Ship 
Sheer <--RelatedTo--> Slip <--RelatedTo--> Toy <--RelatedTo--> One <--RelatedTo--> Foot 