Geography Reference
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at a rate of more than 3.5-4 m (∼12-13 ft) per century, although it is now slowing
(Andrews 1970; Selby 1985; Goudie 1995).
FIGURE 2.2 Generalized distribution and ages (in billions of years) of geologic provinces in North
America, as defined by the major granite-forming and mountain-building events. The interior of
the continent is generally the oldest area, whereas the coastal areas are the youngest, indicating
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