Ear is related to Shell. Shell is a synonym of Case. Case is related to Criminal. Terrorist is a type of Criminal. 
you are likely to find Pollution in/at/on Lawn. Pollution is related to Emission. 
Ear <--RelatedTo--> Shell <--Synonym--> Case <--RelatedTo--> Criminal <--IsA-- Terrorist 
Lawn <--AtLocation-- Pollution <--RelatedTo--> Emission 