Disaster is a type of Emergency. Emergency is related to Area. Area is related to School. School is related to Elementary. 
Generate is a type of Produce. Produce is the opposite of Consume. 
Disaster --IsA--> Emergency <--RelatedTo--> Area <--RelatedTo--> School <--RelatedTo--> Elementary 
Generate --IsA--> Produce <--Antonym--> Consume 