@prefix qx8: <http://data.loterre.fr/ark:/67375/QX8> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .

qx8:-0F9BWP8Q-V
  skos:prefLabel "cendre volcanique"@fr, "volcanic ash"@en ;
  skos:broader qx8:-51JWM91B-R ;
  skos:exactMatch <http://data.loterre.fr/ark:/67375/26L-DVP0F19Q-K>, <https://en.wikipedia.org/wiki/Volcanic_ash>, <https://fr.wikipedia.org/wiki/Cendre_volcanique> ;
  skos:inScheme qx8: ;
  skos:narrower qx8:-W4H7NB9X-H ;
  skos:definition "Les cendres volcaniques sont des fragments de roches et de minéraux de diamètre inférieur à 2 mm, éjectées par un volcan. Ces particules sont si fines qu'elles peuvent voyager sur des centaines de kilomètres et retomber sur le sol sous forme de pluies de cendres. Lorsque les cendres sont éjectées en grande quantité, elles se cimentent généralement pour former une roche que l'on nomme tuf. Dans un environnement sédimentaire marin à basse énergie, les cendres volcaniques qui s'accumulent forment après altération par l'eau de mer des couches de bentonite (une argile). (Adapté de : <a href=\"https://fr.wikipedia.org/wiki/Cendre_volcanique\">https://fr.wikipedia.org/wiki/Cendre_volcanique</a>)"@fr, "Volcanic ash consists of fragments of rock, mineral crystals, and volcanic glass, produced during volcanic eruptions and measuring less than 2 mm (0.079 inches) in diameter. The term volcanic ash is also often loosely used to refer to all explosive eruption products (correctly referred to as tephra), including particles larger than 2 mm. Volcanic ash is formed during explosive volcanic eruptions when dissolved gases in magma expand and escape violently into the atmosphere. The force of the gases shatters the magma and propels it into the atmosphere where it solidifies into fragments of volcanic rock and glass. Ash is also produced when magma comes into contact with water during phreatomagmatic eruptions, causing the water to explosively flash to steam leading to shattering of magma. Once in the air, ash is transported by wind up to thousands of kilometres away. (Adapted from: <a href=\"https://en.wikipedia.org/wiki/Volcanic_ash\">https://en.wikipedia.org/wiki/Volcanic_ash</a>)"@en ;
  a skos:Concept .

qx8: a skos:ConceptScheme .
qx8:-W4H7NB9X-H
  skos:prefLabel "aérosol volcanique"@fr, "volcanic aerosol"@en ;
  a skos:Concept ;
  skos:broader qx8:-0F9BWP8Q-V .

qx8:-51JWM91B-R
  skos:prefLabel "pyroclastite"@fr, "pyroclastite"@en ;
  a skos:Concept ;
  skos:narrower qx8:-0F9BWP8Q-V .