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A long, seismically active submarine ridge system situated in the middle of an ocean basin and marking the site of the upwelling of magma associated with sea-floor spreading. An example is the Mid-Atlantic Ridge.
- ‘This is simply because new ocean floor, as we have seen, continuously forms at the mid-ocean ridges and then spreads away on either side, aging and collecting a progressively thicker sediment blanket as it does so.’
- ‘Although Leg 2 was dogged with technical problems, it proved beyond doubt that the deepest sediments do indeed become younger as you approach the spreading centers at the mid-ocean ridges.’
- ‘The active volcanic vents along the spreading mid-ocean ridges create ideal environments for the circulation of fluids rich in minerals and for ore deposition.’
- ‘The mid-ocean ridge is two chains of mountains separated by a large depression that form at a spreading center (or where two plates are drifting apart).’
- ‘Unlike volcanic activity at mid-ocean ridges, island arc volcanoes can remain fixed over their magma sources for thousands of years, allowing them to sometimes grow above water level and become islands.’
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