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/7e140a1e-385d-4dd3-8b08-6239b082e35e CHEMICAL WEATHERING Date=2013-03-22 User Id=tbs1979 Entity=Definition Operation=UPDATE Field=reference System Note=update Definition Old Value=Adapted from: <br> Jackson, J.A. (1997) <i>Glossary of Geology</i>. 4th ed. Alexandria, VA: American Geological Institute. pg. 110 <BR> <i>McGraw-Hill Dictionary of Earth Science</i>. New York:McGraw-Hill, Inc. 1997. pg 63 New Value=Glossary of Geology Date=2013-02-18 User Id=tbs1979 Entity=BroaderRelation Operation=INSERT User Note=Move Concepts System Note=add broader relation New Value=CHEMICAL WEATHERING [7e140a1e-385d-4dd3-8b08-6239b082e35e,63605] - GEOCHEMICAL PROCESSES [e6fb1b81-8ffc-486f-b1a1-2f292af8cee6,82335] Date=2013-03-22 User Id=tbs1979 Entity=Definition Operation=UPDATE Field=text System Note=update Definition Old Value=Pertaining to the breakdown of an exisiting rock or mineral through chemical, as opposed to physical, means; i.e., dissolution of limestone by acidic groundwater. New Value=Pertaining to the breakdown of an existing rock or mineral through chemical, as opposed to physical, means; i.e., dissolution of limestone by acidic groundwater. Date=2013-02-18 User Id=tbs1979 Entity=BroaderRelation Operation=DELETE User Note=Move Concepts System Note=delete broader relation Old Value=CHEMICAL WEATHERING [7e140a1e-385d-4dd3-8b08-6239b082e35e,63605] - GEOCHEMISTRY [906e647b-2683-4ae7-9986-1aea15582b52,61439] Pertaining to the breakdown of an existing rock or mineral through chemical, as opposed to physical, means; i.e., dissolution of limestone by acidic groundwater. 2013-03-22 09:05:04.0