Environmental is related to Green. Green is related to Hill. Hill is related to Flat. Flat is related to Road. 
Frustration is a type of Disappointment. Homework can cause/lead to Frustration. you are likely to find Homework in/at/on School. you are likely to find Instructor in/at/on School. 
Environmental <--RelatedTo--> Green <--RelatedTo--> Hill <--RelatedTo--> Flat <--RelatedTo--> Road 
Disappointment <--IsA-- Frustration <--Causes-- Homework --AtLocation--> School <--AtLocation-- Instructor 