https://cdn.earthdata.nasa.gov/conduit/upload/5182/KeywordsCommunityGuide_Baseline_v1_SIGNED_FINAL.pdf 23.7 2026-04-15T10:53:30.610Z https://gcmd.earthdata.nasa.gov/KeywordViewer/scheme/sciencekeywords/f2d6aa01-5070-4147-bae1-4b2cad2c3987 TRACE METALS Date=2018-03-07 User Id=tstevens Entity=Definition Operation=UPDATE Field=reference System Note=update Definition Old Value=Environmental Protection Agency New Value=Environmental Protection Agency Date=2018-03-07 User Id=tstevens Entity=BroaderRelation Operation=INSERT User Note=Move Concepts System Note=add broader relation New Value=TRACE METALS [f2d6aa01-5070-4147-bae1-4b2cad2c3987,86265] - CONTAMINANTS [42c6d91b-afef-4638-95c5-0d130828b2e7,84623] Date=2018-03-07 User Id=tstevens Entity=BroaderRelation Operation=DELETE User Note=Move Concepts System Note=delete broader relation Old Value=TRACE METALS [f2d6aa01-5070-4147-bae1-4b2cad2c3987,86265] - WATER QUALITY/WATER CHEMISTRY [8c02f5d1-ce86-4bf5-84d5-b3496cdba6ad,83565] Date=2018-03-07 User Id=tstevens Entity=Definition Operation=UPDATE Field=text System Note=update Definition Old Value=Trace metals are metals in extremely small quantities, almost at the molecular level, that reside in or are present in animal and plant cells and tissue. New Value=Trace metals are metals in extremely small quantities, almost at the molecular level, that reside in or are present in animal and plant cells and tissue. Date=2018-03-07 User Id=tstevens Entity=Definition Operation=UPDATE Field=text System Note=update Definition Old Value=Trace metals are metals in extremely small quantities, almost at the molecular level, that reside in or are present in animal and plant cells and tissue. New Value=Metals in extremely small quantities, almost at the molecular level, that reside in or are present in animal and plant cells and tissue. Metals in extremely small quantities, almost at the molecular level, that reside in or are present in animal and plant cells and tissue. 2018-03-07 09:59:48.0