<http://caligraph.org/ontology/16th-century_volcanic_event>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Event_in_the_geological_history_of_Earth> .
<http://caligraph.org/ontology/Event_in_the_geological_history_of_Earth>	<http://www.w3.org/ns/prov#wasDerivedFrom>	<http://en.wikipedia.org/wiki/Category:Events_in_the_geological_history_of_Earth> .
<http://caligraph.org/ontology/Event_in_the_geological_history_of_Earth>	<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>	<http://www.w3.org/2002/07/owl#Class> .
<http://caligraph.org/ontology/Event_in_the_geological_history_of_Earth>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Natural_event> .
<http://caligraph.org/ontology/18th-century_volcanic_event>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Event_in_the_geological_history_of_Earth> .
<http://caligraph.org/ontology/20th-century_volcanic_event>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Event_in_the_geological_history_of_Earth> .
<http://caligraph.org/ontology/19th-century_volcanic_event>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Event_in_the_geological_history_of_Earth> .
<http://caligraph.org/ontology/Event_in_the_geological_history_of_Earth>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Global_event> .
<http://caligraph.org/ontology/17th-century_volcanic_event>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Event_in_the_geological_history_of_Earth> .
<http://caligraph.org/ontology/15th-century_volcanic_event>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Event_in_the_geological_history_of_Earth> .
<http://caligraph.org/ontology/21st-century_volcanic_event>	<http://www.w3.org/2000/01/rdf-schema#subClassOf>	<http://caligraph.org/ontology/Event_in_the_geological_history_of_Earth> .
<http://caligraph.org/ontology/Event_in_the_geological_history_of_Earth>	<http://www.w3.org/2000/01/rdf-schema#label>	"Event in the geological history of Earth" .