_:b1218170 . _:b1218170 . _:b1218170 . _:b1218170 "A gyre in oceanography is any large system of rotating ocean currents, particularly those involved with large wind movements. Gyres are caused by the Coriolis Effect; planetary vorticity along with horizontal and vertical friction, which determine the circulation patterns from the wind curl (torque)."^^ . _:b1218170 "Wikipedia:Ocean_gyre"^^ .