{"thcode":2,"term":{"code":1369,"name":"porosity","parent":1367,"scope":"The proportion of open space in a rock or unconsolidated material."},"uf":[{"name":"interstices","usewith":false},{"name":"soil porosity","usewith":false}],"bt":[{"code":1367,"name":"earth material properties","parent":287,"scope":"Physical characteristics of rocks and unconsolidated earth materials such as soils and sediments."},{"code":287,"name":"earth characteristics","parent":1174,"scope":"The measurable, definable properties and features of the earth."},{"code":1174,"name":"topics","parent":1,"scope":"Themes, subjects, and concerns for which USGS information resources are relevant."},{"code":1,"name":"Categories","parent":null,"scope":"Thematic terms for categorizing information resources.  This thesaurus is intended to support finding and understanding scientific information."}],"nt":[],"rt":[{"code":2295,"name":"hydrocarbon reservoir processes","parent":101,"scope":"Interactions among groundwater, hydrocarbons, and rock properties of subsurface geological formations, affecting the potential of those formations to form, trap, and permit the passage and extraction of hydrocarbons."}]}