| 31. | The floor is formed into a structural basin by a series of geologic faults and fracture zones.
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| 32. | The northerly side is a transform boundary with the Juan de Fuca Plate, the Blanco Fracture Zone.
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| 33. | The Tydeman fracture zone ( ) between Madeira and the Azores is named after " Tydeman ".
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| 34. | The SWIR has ultra-slow spreading rates, a rough topography, and great number of large offset fracture zones.
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| 35. | The Upper Rhine Rift is part of a fracture zone reaching from the Mediterranean Sea to Norway.
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| 36. | The southern part of the Shackleton Fracture Zone is the former eastern edge of the Phoenix Plate.
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| 37. | Also known as the Romanche Trench, this fracture zone separates the North Atlantic and South Atlantic Oceans.
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| 38. | Many large fracture zones aligned in an east-west direction, occur in the floor of the northeastern Pacific.
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| 39. | However, by observing the fracture zones, one can determine both the direction and rate of past plate motion.
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| 40. | The complexity in the Tj�rnes Fracture Zone can be generally explained by the magmatic processes and plate motions.
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