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In Figure 4.2, you can see that the Atlantic Plain is in the interior of the North American Plate, about 2,000 miles from its eastern edge.
Figure 4.2 Simplified map of Earth's principal tectonic plates. The red arrows indicate the direction of movement at plate boundaries. (U.S. Geological Survey, 1996. Public Domain).
Source: U.S. Geological Survey, https://en.wikipedia.org/wiki/Plate_tectonics#/media/File:Plates_tect2_en.svg This work is in the Public Domain.