@prefix agrovoc: <http://aims.fao.org/aos/agrovoc/> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix ns0: <http://art.uniroma2.it/ontologies/vocbench#> .
@prefix dc: <http://purl.org/dc/terms/> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .
@prefix skos: <http://www.w3.org/2004/02/skos/core#> .

agrovoc:xDef_bd32bea9
  rdf:value "Hard, gray to black extrusive volcanic rock. Contains 45 to 52 percent silica, is mafic, rich in iron and magnesium, fine-grained, often displays \"frozen\" gas bubbles (vesicles) and sometimes contains phenocrysts of feldspar, olivine, pyroxene, and iron titanium oxides. Because of low silica content, basalt has a low viscosity (resistance to flow)."@en ;
  ns0:hasSource "U. S. Geological Survey, 2009. Glossary. Living with a Volcano in Your Backyard–An Educator's Guide https://pubs.usgs.gov/gip/19/downloads/Appendixes/V_Glossary.pdf" ;
  dc:created "2024-05-20T16:37:33"^^xsd:dateTime ;
  dc:modified "2025-01-31T12:49:50"^^xsd:dateTime .

agrovoc:c_32387 skos:definition agrovoc:xDef_bd32bea9 .