An elevation of great extent which rises at a very gentle angle from a surrounding depression is termed a rise, one which is relatively narrow and steep-sided a ridge, and one which is approximately equal in length and breadth but steep-sided a plateau, whether it springs direct from a depr
The valleys rarely exceed more than a few miles in width, are usually steep-sided, and frequently are traversed by longitudinal ranges of hills and cross ridges; but the Pennsylvania portion of the Appalachian or Great Valley, which forms a distinct division of the central province and lies between
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