"ENVO:01000161"^^ . "2010-03-20T09:18:54Z"^^ . "ENVO"^^ . "pbuttigieg"^^ . . "A marine sponge reef is marine reefs primarily built by marine sponges. The primary frame-building sponges are all members of the order Hexactinosa. They are found only in glacier-scoured troughs of low-angle continental shelf. The seafloor is stable and consists of rock, coarse gravel, and large boulders."^^ . "marine sponge reef"^^ . .