"FTT:610"^^ . . "TGN:23462"^^ . "ENVO:00000275"^^ . _:b1216512 . "TGN:23464"^^ . "FTT:1021"^^ . . _:b1216512 . "ocean trench"^^ . "SWEETRealm:Trench"^^ . "ENVO"^^ . "Trench"^^ . "undersea trough"^^ . "trench"^^ . "undersea trench"^^ . "Hemispheric-scale long but narrow topographic depressions of the sea floor. They are the deepest parts of the ocean floor."^^ . "ocean trench"^^ . _:b1216512 . "deep"^^ . "Geonames:U.TRGU"^^ . "TROUGH"^^ . "EcoLexicon:trench"^^ . _:b1216512 . "FTT:609"^^ . "deep sea trench"^^ . "Geonames:U.TRNU"^^ . "Wikipedia:Ocean_trench"^^ . "trough"^^ . "EcoLexicon:deep_sea_trench"^^ .