Individual #economic_geology  the branch of geology that deals with economically valuable geological materials
  >part of:  geology  a science that deals with the history of the earth as recorded in rocks
  >part:  petroleum_geology__petroleumgeology  the branch of economic geology that deals with the occurrence and exploitation of oil and gas fields
  >part:  mining_geology  the branch of economic geology that deals with the applications of geology to mining

No statement uses or specializes economic_geology; click here to add one.