Answer
During the Cenozoic era, the eastern margin of North America was associated with active plate boundaries, such as subduction zones and continental collisions. These tectonic processes led to the formation of the Appalachian Mountains and various volcanic and seismic activities. In contrast, the western margin of North America was marked by the presence of transform faults and divergent boundaries. The movement of the Pacific Plate relative to the North American Plate led to the formation of the San Andreas Fault and the Basin and Range province.
Work Step by Step
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