Oceanic core complex
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An oceanic core complex, or megamullion, is a seabed geologic feature that forms a long ridge perpendicular to a mid-ocean ridge. It contains smooth domes that are lined with transverse ridges like a
Saint Peter Saint Paul Megamullion, Equatorial Atlantic Ocean
Mid-ocean ridge
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A mid-ocean ridge is a seafloor mountain system formed by plate tectonics. It typically has a depth of about 2,600 meters and rises about 2,000 meters above the deepest portion of an ocean basin. This
Rift zone in Þingvellir National Park, Iceland. The island is a sub-aerial part of the Mid-Atlantic Ridge, meaning that the ridge rises above sea level here.
Magnesium/calcium ratio changes at mid-ocean ridges