Formation is related to Drop. Drop is a type of Particle. Particle is related to Note. Note is related to Class. 
you are likely to find Boat in/at/on Bay. Boat is related to Big. 
Formation <--RelatedTo--> Drop --IsA--> Particle <--RelatedTo--> Note <--RelatedTo--> Class 
Bay <--AtLocation-- Boat <--RelatedTo--> Big 