<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:skos="http://www.w3.org/2004/02/skos/core#" xmlns:gcmd="https://gcmd.earthdata.nasa.gov/kms#" xmlns:dcterms="http://purl.org/dc/terms/" xml:base="https://gcmd.earthdata.nasa.gov/kms/concept/">
  <gcmd:gcmd>
    <gcmd:termsOfUse>https://cdn.earthdata.nasa.gov/conduit/upload/5182/KeywordsCommunityGuide_Baseline_v1_SIGNED_FINAL.pdf</gcmd:termsOfUse>
    <gcmd:keywordVersion>23.7</gcmd:keywordVersion>
    <gcmd:schemeVersion>2026-04-15T10:53:30.610Z</gcmd:schemeVersion>
    <gcmd:viewer>https://gcmd.earthdata.nasa.gov/KeywordViewer/scheme/sciencekeywords/2d36c283-2fe3-4a08-aeb3-6a8146e79bb3</gcmd:viewer>
  </gcmd:gcmd>
  <skos:Concept rdf:about="2d36c283-2fe3-4a08-aeb3-6a8146e79bb3">
    <skos:broader rdf:resource="b9c56939-c624-467d-b196-e56a5b660334"/>
    <skos:prefLabel xml:lang="en">TRACE ELEMENTS/TRACE METALS</skos:prefLabel>
    <gcmd:reference gcmd:text="Porteous, A. 1996. Dictionary of Environmental Science and Technology, 2nd ed. John Wiley and Sons, NY." xml:lang="en"/>
    <skos:definition xml:lang="en">Trace elements are elements that occur in minute quantities. Trace elementscan include copper, silicon, cobalt, iron, zinc, iodine, and manganese.</skos:definition>
    <skos:inScheme rdf:resource="https://gcmd.earthdata.nasa.gov/kms/concepts/concept_scheme/sciencekeywords"/>
  </skos:Concept>
</rdf:RDF>