{"thcode":2,"term":{"code":1168,"name":"tides (oceanic)","parent":816,"scope":"The periodic rise and fall of the level of the sea due to the gravitational attraction of the moon and sun. Occurs twice each day."},"uf":[{"name":"ocean tides","usewith":false}],"bt":[{"code":816,"name":"ocean processes","parent":101,"scope":"Recurrent natural changes that are physical, biological, or chemical, actively affecting the seas and oceans."},{"code":101,"name":"biological and physical processes","parent":1174,"scope":"All continuing activities, functions, and phenomena associated with organisms and non-living matter."},{"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":812,"name":"ocean circulation","parent":816,"scope":"Movement of large masses of water within an ocean."},{"code":814,"name":"ocean currents","parent":816,"scope":"Recurrent strong flows of seawater generated by wind or variations in water density along a given path."},{"code":818,"name":"ocean sciences","parent":291,"scope":"Sciences involved in the study of geological, biological, chemical, and physical characteristics and processes of the oceans."}]}