Need is related to Serious. Serious is related to Condition. Condition is part of Agreement. 
Category is related to Mineral. you are likely to find Mineral in/at/on Earth. Earth have Gravity. Gravity is related to Big. 
Need <--RelatedTo--> Serious <--RelatedTo--> Condition --PartOf--> Agreement 
Category <--RelatedTo--> Mineral --AtLocation--> Earth --HasA--> Gravity <--RelatedTo--> Big 