. . "Underwater, flat areas of a seafloor, usually appearing adjacent to continents and covered with a layer of sediment."@en . "2013-10-15T10:18:31"^^ . "plains, abyssal"@en . "300386923" . . "2013-08-02T15:04:34"^^ . "abyssal plains"@en . "abyssal plain"@en .