{"thcode":2,"term":{"code":287,"name":"earth characteristics","parent":1174,"scope":"The measurable, definable properties and features of the earth."},"uf":[],"bt":[{"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":[{"code":67,"name":"atmospheric properties","parent":287,"scope":"Characteristics of the mass of gases surrounding the earth  such as composition, temperature, pressure, and humidity."},{"code":1367,"name":"earth material properties","parent":287,"scope":"Physical characteristics of rocks and unconsolidated earth materials such as soils and sediments."},{"code":292,"name":"earth structure","parent":287,"scope":"Major interior structural features of the planet earth."},{"code":455,"name":"geologic history","parent":287,"scope":"Record (and inferred reconstruction) of the origin and development of the earth since its formation."},{"code":459,"name":"geologic structure","parent":287,"scope":"General position of rocks in an area, and geometrical relationships among rocks."},{"code":501,"name":"gravitational field (earth)","parent":287,"scope":"Region or space around earth's mass which exerts a force that mutually attracts other masses in proportion to the product of the two masses and the distance between them."},{"code":2090,"name":"lakebed characteristics","parent":287,"scope":"Characteristics of the bottom of inland bodies of water."},{"code":626,"name":"land surface characteristics","parent":287,"scope":"Features and attributes of earth's land surface."},{"code":677,"name":"magnetic field (earth)","parent":287,"scope":"The magnetic region surrounding earth.  It is generated by the dipolar characteristic of earth's core whereby earth itself acts as a great spherical magnet with poles near, but not exactly at, the North and South poles."},{"code":810,"name":"ocean characteristics","parent":287,"scope":"The attributes and process of seas and oceans."},{"code":1005,"name":"rocks and deposits","parent":287,"scope":"Solid masses that make up the earth's crust as well as accumulations of materials. Use for major rock types and unconsolidated deposits. For deposits of economic value, see related terms."},{"code":1072,"name":"snow and ice cover","parent":287,"scope":"Accumulation of snow or ice blanketing land surfaces."},{"code":1103,"name":"stratigraphic sections","parent":287,"scope":"Vertical arrangement in layers of rock units whose sequence is used to study the geological history of the strata."},{"code":1176,"name":"topography","parent":287,"scope":"Configuration of the land surface and sea floor."}],"rt":[{"code":291,"name":"earth sciences","parent":1019,"scope":"Broad term for all science related to the study of the earth."}]}