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/9c90825c-a35f-4165-8248-e90ab869f8ec ORGANIC MATTER Date=2018-03-06 User Id=tstevens Entity=BroaderRelation Operation=DELETE User Note=Move Concepts System Note=delete broader relation Old Value=ORGANIC MATTER [9c90825c-a35f-4165-8248-e90ab869f8ec,85083] - WATER QUALITY/WATER CHEMISTRY [8c02f5d1-ce86-4bf5-84d5-b3496cdba6ad,83565] Date=2018-03-06 User Id=tstevens Entity=BroaderRelation Operation=INSERT User Note=Move Concepts System Note=add broader relation New Value=ORGANIC MATTER [9c90825c-a35f-4165-8248-e90ab869f8ec,85083] - CONTAMINANTS [42c6d91b-afef-4638-95c5-0d130828b2e7,84623] Date=2018-03-06 User Id=tstevens Entity=Definition Operation=UPDATE Field=reference System Note=update Definition Old Value=The Nature and Properties of Soils, Prentice Hall, 1996. New Value="Natural Organic Matter," GreenFacts, 22 Apr, 2007 Date=2018-03-06 User Id=tstevens Entity=Definition Operation=UPDATE Field=text System Note=update Definition Old Value=Soil constituents consisting of a wide range of organic (carbonaceous) substances, including living organisms, carbonaceous remains of organisms which once occupied the soil, and organic compounds produced by current and past metabolism in the soil. New Value=Refers to the large pool of carbon-based compounds found within natural and engineered, terrestrial and aquatic environments. Refers to the large pool of carbon-based compounds found within natural and engineered, terrestrial and aquatic environments. 2018-03-06 13:45:13.0