Waste is related to Peel. Peel is a synonym of Skin. you are likely to find Skin in/at/on Fruit. Fruit is related to Bat. 
Moon is related to Rock. Crystal is a type of Rock. Salt is a type of Crystal. Salt is related to Sodium. 
Waste <--RelatedTo--> Peel <--Synonym--> Skin --AtLocation--> Fruit <--RelatedTo--> Bat 
Moon <--RelatedTo--> Rock <--IsA-- Crystal <--IsA-- Salt <--RelatedTo--> Sodium 