. Elementary physical geography . f continents is 8well illustrated in North Amer- srica (Fig. 129), which may beconsidered a typical continent;and it will be described in moredetail in later parts of the chap-ter. Plains usually occupy the Sinterior portion of the continent, ^and these are sometimes in the form of low plateaus; while Mid AtlanticBidge Spain 252 PHYSICAL GEOGRAPHY. in some cases they are even interior basins. The land surfaceis very irregular, the irregularities being partly due to origi-nal features of the earths crust, and partly to the sculpturingof these by the agents of d
. Elementary physical geography . f continents is 8well illustrated in North Amer- srica (Fig. 129), which may beconsidered a typical continent;and it will be described in moredetail in later parts of the chap-ter. Plains usually occupy the Sinterior portion of the continent, ^and these are sometimes in the form of low plateaus; while Mid AtlanticBidge Spain 252 PHYSICAL GEOGRAPHY. in some cases they are even interior basins. The land surfaceis very irregular, the irregularities being partly due to origi-nal features of the earths crust, and partly to the sculpturingof these by the agents of denudation (see Chapter XIII.).Geological conditions conclusively prove that the con- Fig. map of North America (Lamberts projection). tinents are subject to changes, and that the present form ismerely the result of an evolution which has long been inprogress. Even at present, in some cases, there are changesof considerable moment still in progress. The mountainswhich form the border of the continents have been elevated. Face page 253
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