What is {volume as quantity} of {World Ocean} that is {sourcing circumstances} is {common} ?
What is the minimum water volume required to be declared a world ocean?
What volume of quantity declared as world ocean?
SELECT ?u WHERE { ?h property:sourcing_circumstances resource:common . ?h property:volume_as_quantity ?u . resource:World_Ocean property:volume_as_quantity ?h }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q715269> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P2234> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
?statement <http://www.wikidata.org/entity/P1480> <http://wikidata.dbpedia.org/resource/Q54836621>
} 

SELECT ?obj WHERE { wd:Q715269 p:P2234 ?s . ?s ps:P2234 ?obj . ?s pq:P1480 wd:Q54836621 }