@prefix dct: . @prefix ns1: . @prefix ns2: . @prefix ns3: . @prefix rdfs: . @prefix skos: . a skos:Concept ; dct:created "2019-01-14" ; dct:modified "2019-01-14" ; ns3:hasProfile ; ns2:status ; rdfs:seeAlso ; skos:definition "Depth is the vertical distance below the surface. A Secchi disk is a patterned disk that is used to measure water transparency"@en ; skos:exactMatch ; skos:prefLabel "secchi depth of sea water"@en ; ns1:hadPrimarySource .