you are likely to find Snake in/at/on Tree. Tree is a type of Site. Lake is a type of Site. you are likely to find Pollution in/at/on Lake. 
Yell is related to Like. Like is related to Cool. Fun can be Cool. 
Snake --AtLocation--> Tree --IsA--> Site <--IsA-- Lake <--AtLocation-- Pollution 
Yell <--RelatedTo--> Like <--RelatedTo--> Cool <--HasProperty-- Fun 