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

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

nalt:55741_def
  a <https://lod.nal.usda.gov/naltv#Definition> ;
  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" .

nalt:55741 skos:definition nalt:55741_def .