Weegy: The Mid-Atlantic Ridge is an example of what is called a slow-spreading mid-oceanic ridge system, which typically is broad with a deep, central rift valley. [ [ (Fast-spreading systems are more typical of the Pacific Ocean, where deep trenches are more common than in the Atlantic.) New seabed is continually being formed from the spreading ridge, which creates relatively shallow areas in the middle of the Atlantic above the extremely flat abyssal plains that begin at the margins of the continental shelves. ] ]
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