@prefix skos: <http://www.w3.org/2004/02/skos/core#> .

<https://gcmd.earthdata.nasa.gov/kms/concept/d8606e80-3d34-4540-a355-5f99737f7ab7>
  skos:prefLabel "PERMAFROST TEMPERATURE"@en ;
  a skos:Concept ;
  skos:broader <https://gcmd.earthdata.nasa.gov/kms/concept/c82f3480-545f-4491-83f1-0477369ddcd8> .

<https://gcmd.earthdata.nasa.gov/kms/concept/c82f3480-545f-4491-83f1-0477369ddcd8>
  skos:changeNote """2015-12-10 17:11:34.0 [aaleman] Insert Concept 
add narrower relation (PERMAFROST [c82f3480-545f-4491-83f1-0477369ddcd8,84051] - PERMAFROST TEMPERATURE [d8606e80-3d34-4540-a355-5f99737f7ab7,158553]); 
""" ;
  skos:definition """1. (Also called perennially frozen ground, pergelisol, permanently frozen
ground.) A layer of soil or bedrock at a variable depth beneath the surface of
the earth in which the temperature has been below freezing continuously from a
few to several thousands of years. Permafrost exists where the summer heating
fails to descend to the base of the layer of frozen ground. A continuous
stratum of permafrost is found where the
annual mean temperature is below about 5C (23F). <p>2. As limited in
application by P. F. Svetsov, soil that is known to have been frozen for at
least a century. <p>
Muller, S. W., 1947: Permafrost, or Permanently Frozen Ground, and
Related Engineering Problems, <p>
Hare, F. K., 1951: Compendium of Meteorology, p. 958, and map, p.
956."""@en ;
  skos:narrower <https://gcmd.earthdata.nasa.gov/kms/concept/d8606e80-3d34-4540-a355-5f99737f7ab7> ;
  skos:prefLabel "PERMAFROST"@en ;
  skos:inScheme <https://gcmd.earthdata.nasa.gov/kms/concepts/concept_scheme/sciencekeywords> ;
  skos:broader <https://gcmd.earthdata.nasa.gov/kms/concept/376a1d5c-2496-4381-981f-bc047af92044> ;
  a skos:Concept .

<https://gcmd.earthdata.nasa.gov/kms/concept/376a1d5c-2496-4381-981f-bc047af92044>
  skos:prefLabel "FROZEN GROUND"@en ;
  a skos:Concept ;
  skos:narrower <https://gcmd.earthdata.nasa.gov/kms/concept/c82f3480-545f-4491-83f1-0477369ddcd8> .