https://cdn.earthdata.nasa.gov/conduit/upload/5182/KeywordsCommunityGuide_Baseline_v1_SIGNED_FINAL.pdf 23.8 2026-04-29T10:52:37.449Z https://gcmd.earthdata.nasa.gov/KeywordViewer/scheme/sciencekeywords/912245ce-a81e-4d3b-b4fb-f71c8da63357 CONTAMINANT LEVELS/SPILLS Date=2012-06-29 User Id=tbs1979 Entity=Definition Operation=UPDATE Field=reference System Note=update Definition Old Value=Rand, Gary M. 1995. Fundamentals of Aquatic Toxicology: Effects, Environmental Fate, and Risk Assessment. Taylor and Francis. Washington, D.C. New Value=Princeton University Dictionary Date=2012-06-29 User Id=tbs1979 Entity=Definition Operation=UPDATE Field=text System Note=update Definition Old Value=Contaminants are foreign agents that are present, as in water or sediment which may produce a physical or chemical change. New Value=A measurement of the frequency of contaminant spills in the environment and whether the contaminant spills is hazardous to a population. Measuring the level of contaminants in the environment will determine if there is a hazard to a population. Date=2012-06-27 User Id=tbs1979 Entity=PrefLabel Operation=UPDATE Field=text System Note=update PrefLabel Old Value=CONTAMINANTS New Value=CONTAMINANT LEVELS/SPILLS A measurement of the frequency of contaminant spills in the environment and whether the contaminant spills is hazardous to a population. Measuring the level of contaminants in the environment will determine if there is a hazard to a population. 2012-06-29 14:38:08.0