. "aquifer"^^ . _:b1218025 . . _:b1218025 . _:b1218024 . _:b1218024 . "ENVO"^^ . _:b1218024 . _:b1218025 . "SWEETRealm:Aquifer"^^ . "An underground layer of water-bearing permeable rock or unconsolidated materials (gravel, sand, silt, or clay) from which groundwater can be usefully extracted using a water well."^^ . _:b1218024 . "Wikipedia:Aquifer"^^ . "ENVO:00012408"^^ . "EcoLexicon:aquifer"^^ . _:b1218025 .