Fishermen off South Africa pull up an ungainly five-foot ... Marie Tharp, studying echo soundings, discovers that the Mid-Atlantic Ridge conceals a long rift valley, which turns out to be part ...

The expedition also found that a continuous mountain-like ridge runs through the Atlantic to the southwest of Africa ... It is now called the Mid-Ocean Ridge. In 1953, American physicists Maurice ...

The Atlantic ... and Africa. Scientists from the University of Southampton have found evidence of an extraordinary geological process more than 600 kilometers beneath the Mid-Atlantic Ridge.