<?xml version="1.0" encoding="UTF-8"?> <rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:obo_purl="http://purl.obolibrary.org/obo/" xmlns:owl="http://www.w3.org/2002/07/owl#" xmlns:rdfs="http://www.w3.org/2000/01/rdf-schema#" xmlns:metadata_def="http://data.bioontology.org/metadata/def/" xmlns:metadata="http://data.bioontology.org/metadata/"> <owl:Class rdf:about="http://purl.obolibrary.org/obo/ENVO_01000552"> <rdfs:subClassOf rdf:resource="http://purl.obolibrary.org/obo/ENVO_01000554"/> <metadata_def:mappingSameURI rdf:resource="http://purl.obolibrary.org/obo/ENVO_01000552"/> <metadata_def:mappingLoom>naturalgas</metadata_def:mappingLoom> <metadata_def:prefLabel>natural gas</metadata_def:prefLabel> <obo_purl:IAO_0000115>Natural gas is a hydrocarbon gas mixture consisting primarily of methane, but commonly includes varying amounts of other higher alkanes and sometimes a usually lesser percentage of carbon dioxide, nitrogen, and/or hydrogen sulfide. Natural gas is a fossil fuel formed when layers of buried plants and gases are exposed to intense heat and pressure over thousands of years.</obo_purl:IAO_0000115> <metadata:prefixIRI>ENVO:01000552</metadata:prefixIRI> <rdfs:label xml:lang="en">natural gas</rdfs:label> <obo_purl:RO_0000087 rdf:resource="http://purl.obolibrary.org/obo/CHEBI_35230"/> <obo_purl:RO_0002473 rdf:resource="http://purl.obolibrary.org/obo/CHEBI_16183"/> </owl:Class> <rdf:Description rdf:about="http://purl.obolibrary.org/obo/ENVO_01000555"> <rdfs:subClassOf> <rdf:Description rdf:about="http://purl.obolibrary.org/obo/ENVO_01000552"> <metadata_def:mappingSameURI rdf:resource="http://purl.obolibrary.org/obo/ENVO_01000552"/> </rdf:Description> </rdfs:subClassOf> </rdf:Description> </rdf:RDF>