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The shaping of a continent, North America. - 1985. The active West. 22 x 18 inches unfolded. One side shows Earth's Dunamic crust with spreading, subsduction, collision, accretion, faulting and hot spots. The other side changes in the area with explanation and intense description. It mentions the San Andreas Fault, volcanoes like Mount St. Helens and much more. Another great National Geographic publication.