. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography Figure 2—The Australian plate is drifting north about 8 cm/yr. Australia was detached from Antarctica only about 50 million years ago in the Eocene. This plate is moving nearly at right angles to the Pacific plate so that the northern boundary is a subduction zone for the Australian plate and a shear transform zone for the Pacific plate. The reverse holds true for the eastern margin of the Australian plate. The South American and North American plat
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography Figure 2—The Australian plate is drifting north about 8 cm/yr. Australia was detached from Antarctica only about 50 million years ago in the Eocene. This plate is moving nearly at right angles to the Pacific plate so that the northern boundary is a subduction zone for the Australian plate and a shear transform zone for the Pacific plate. The reverse holds true for the eastern margin of the Australian plate. The South American and North American plates plus the Australian and Indian plates seem to be moving in unison and joined today so that, in terms of the major plates, the earth may be described as a highly distorted, spherical hexahedron or "; A few years ago S. W. Carey reviewed the various symmetries of the earth, in- cluding a listing of many historical comparisons that have been made about the earth with respect to various,. Figure 3—The Indian plate. The Indian subcontinent has under- gone a remarkable drift since being detached from Antarctica. New ocean floor has been emplaced between the mid-ocean ridge which has maintained its position equidistant between Antarctica and India, while the northern portion of the plate has been con- sumedin the Himalayan trench. About 20 million years ago India collided with Asia, throwing in the Himalayan rampart. These mountains are as high as a continental slope (ca. m), indicat- ing that the underlying sialic slab is two continents thick due to underthrusting and dovetailing. A cube, of course, has eight corners or coigns as well as six faces. Similarly, the crustal plates intersect in so- called triple junctions. These play a fundamental role in geotectonics which still remains to be fully elucidated. A few types of triple junctions are inherently unstable, that is, they will change their geometry with time, while most are stable. Near the Azores, fo
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