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By M. J. Keen and J. A. Jacobs (Auth.)
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In the Atlantic Ocean it is called the Mid-Atlantic Ridge, in the Pacific Ocean it is formed by the East Pacific Rise and the Pacific-Antarctic Ridge, and in the Indian Ocean by the Carlsberg Ridge. The various parts can be defined by their topographic forms and by their geophysical characteristics. These ( 1 9 9) are similar but not identical and M e n a r d has questioned the continuity of the system, preferring to regard the various parts as having a similar underlying cause but being in different stages of development.
The edges of the continental shelves and the continental slopes are cut in places by canyons, called submarine canyons. These may be V-shaped and several kilometres in width at the top of the V, up to hundreds of ( 8 8) metres in depth and may have steep-sided walls. An example of one from the continental margin of the western part of the North Atlantic, The Topography of the Ocean Floor 41 the Gully, is shown in Figs. 7. T h e difficulties which have been found in accounting for the origins of these canyons will be referred to subsequently, but we may note from Figs.
Bullard originally used thermocouples in an oil-filled probe 4-5 m long and it was necessary to leave the probe in the sediment for 30 min after penetration to allow heat generated to be dissipated. This had the result that the probe was frequently bent on extraction from the sediment. A separate core was obtained as close to the site of the probe as possible so that the conductivity of the sediments could be determined, but except by chance the two sites would be at least more than 1 or 2 km apart.