@prefix nalt: <https://lod.nal.usda.gov/nalt/> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix ns0: <https://lod.nal.usda.gov/naltv#> .
@prefix dc: <http://purl.org/dc/terms/> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .

nalt:105520
  skos:prefLabel "arenas de alquitrán"@es, "oil sands"@en ;
  a <https://lod.nal.usda.gov/naltv#Topic>, skos:Concept ;
  skos:broader nalt:55741 .

nalt:105519
  skos:prefLabel "combustibles fósiles"@es, "fossil fuels"@en ;
  a <https://lod.nal.usda.gov/naltv#Topic>, skos:Concept ;
  skos:narrower nalt:55741 .

nalt:53664
  skos:prefLabel "pizarra"@es, "shale"@en ;
  a <https://lod.nal.usda.gov/naltv#Product>, skos:Concept ;
  skos:narrower nalt:55741 .

<https://lod.nal.usda.gov/naltv#Topic>
  rdfs:label "Topic"@en ;
  a owl:Class .

nalt:55741
  skos:broader nalt:53664, nalt:105519 ;
  a <https://lod.nal.usda.gov/naltv#Topic>, skos:Concept ;
  skos:altLabel "esquisto de petróleo"@es ;
  skos:prefLabel "oil shale"@en, "pizarra de aceite"@es ;
  skos:hiddenLabel "oil shales"@en, "kerogen shales"@en, "oil-shales"@en, "oil-shale"@en, "kerogen shale"@en ;
  skos:inScheme <https://lod.nal.usda.gov/nalt> ;
  ns0:marc001 "25997" ;
  dc:created "2006-01-19"^^xsd:date ;
  skos:definition nalt:55741_def ;
  dc:modified "2017-11-22"^^xsd:date ;
  skos:narrower nalt:105520 .

nalt:55741_def
  rdf:value "Roca sedimentaria marrón o negra, finamente estratificada, que contiene kerógeno y que produce hidrocarburos líquidos o gaseosos como resultado de la destilación. A pesar de su nombre, no contiene petróleo, sino un tipo de materia orgánica denominada kerógeno, un precursor del petróleo que se convierte en petróleo bruto cuando se calienta a una temperatura entre 450 oC y 500 oC."@es, "A kerogen-bearing, finely laminated brown or black sedimentary rock that will yield liquid or gaseous hydrocarbons on distillation. Oil shale, despite the name, does not actually contain oil, but rather a type of organic matter called kerogen, a precursor of oil that is converted to a type of crude oil when heated to about 450 – 500° C."@en ;
  dc:source "The United States Geological Survey, U.S. Department of the Interior" ;
  a ns0:Definition .

<https://lod.nal.usda.gov/nalt>
  rdfs:label "NALT Full"@en ;
  a skos:ConceptScheme .