you are likely to find Bag in/at/on Trash. you are likely to find Cat in/at/on Bag. you are likely to find Cat in/at/on Cage. 
Cave is a type of Explore. Explore is related to Exploration. 
Trash <--AtLocation-- Bag <--AtLocation-- Cat --AtLocation--> Cage 
Cave --IsA--> Explore <--RelatedTo--> Exploration 