{"thcode":2,"term":{"code":849,"name":"outer core (earth)","parent":211,"scope":"Outer zone of the earth's core between the mantle and the inner core."},"uf":[],"bt":[{"code":211,"name":"core (earth)","parent":292,"scope":"The superdense center of the earth composed of two layers: a liquid outer layer and a solid inner core of metallic iron-nickel alloy."},{"code":292,"name":"earth structure","parent":287,"scope":"Major interior structural features of the planet earth."},{"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":470,"name":"geophysics","parent":291,"scope":"Branch of geology studying the physical characteristics and phenomena of the earth and its atmosphere."}]}