A mid-ocean ridge (MOR) is a seafloor mountain system formed by plate tectonics. It typically has a depth of ~ 2,600 meters (8,500 ft) and rises about two kilometers above the deepest portion of an ...

A new study about Earth's northernmost seafloor hydrothermal system shows even more variety ... on the ultraslow-spreading Gakkel Ridge in the Arctic Ocean. Initial reports about the Polaris ...