Effect is related to Outcome. Outcome is related to Experiment. Experiment is related to Unknown. Unknown is a type of Variable. 
Shed is related to Garden. Garden is related to Vegetable. Vegetable is related to Tree. you are likely to find Root in/at/on Tree. 
Effect <--RelatedTo--> Outcome <--RelatedTo--> Experiment <--RelatedTo--> Unknown --IsA--> Variable 
Shed <--RelatedTo--> Garden <--RelatedTo--> Vegetable <--RelatedTo--> Tree <--AtLocation-- Root 