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/fb52b51d-8bb4-4b04-907b-c130ec706f85 STABLE ISOTOPES Date=2018-03-07 User Id=tstevens Entity=Definition Operation=UPDATE Field=reference System Note=update Definition Old Value=Adapted from: Webster's College Dictionary. 1991. Random House. New Value=Adapted from: Webster's College Dictionary. 1991. Random House. Date=2018-03-07 User Id=tstevens Entity=Definition Operation=UPDATE Field=text System Note=update Definition Old Value=Any non-radioactive form of a chemical element, having the same atomic weight as that element (i.e. same number of protons), but a different number of neutrons. New Value=Any non-radioactive form of a chemical element, having the same atomic weight as that element (i.e. same number of protons), but a different number of neutrons. Date=2018-03-07 User Id=tstevens Entity=BroaderRelation Operation=INSERT User Note=Move Concepts System Note=add broader relation New Value=STABLE ISOTOPES [fb52b51d-8bb4-4b04-907b-c130ec706f85,83825] - ISOTOPES [4d5f7ae1-3368-468b-825b-e72c1df24508,310627] Date=2018-03-07 User Id=tstevens Entity=BroaderRelation Operation=DELETE User Note=Move Concepts System Note=delete broader relation Old Value=STABLE ISOTOPES [fb52b51d-8bb4-4b04-907b-c130ec706f85,83825] - WATER QUALITY/WATER CHEMISTRY [8c02f5d1-ce86-4bf5-84d5-b3496cdba6ad,83565] Any non-radioactive form of a chemical element, having the same atomic weight as that element (i.e. same number of protons), but a different number of neutrons. 2018-03-07 10:08:21.0