_:b1218676 . _:b1218672 . _:b1218677 . _:b1218674 _:b1218673 . _:b1218677 . _:b1218671 . "ENVO:02000003"^^ . "A pockmark field is an undersea feature formed by shallow seabed depressions, typically several tens of metres across and a few metres deep. Generally, they are formed in soft, fine-grained seabed sediments by the escape of fluids (gas or water, but mainly methane) into the water column."^^ . _:b1218674 _:b1218671 . _:b1218677 . _:b1218677 . _:b1218676 . _:b1218676 . _:b1218670 . . _:b1218676 . . _:b1218671 . _:b1218670 _:b1218675 . "pockmark field"^^ . _:b1218673 . "ENVO"^^ . _:b1218673 _:b1218672 . _:b1218671 . _:b1218670 . _:b1218675 _:b1218674 . _:b1218672 . _:b1218675 . _:b1218672 .