. Elementary physical geography;. stor summit mate-rially higher thanthe rest forms apeak. Sometimesthe peak is a highcrag, or a pinna-cle of rock, butthe name is also applied to volcanic cones. Elevations thaiproperly are plateaus—as Broad Mountain, Pocono Moun-tain, and Broad Top, in the Appalachian system—arealso called mountains. Isolated peaks, or monadnocks, are not uncommon, hut for thegreater part they occur in mountain ranges that have been greatlyworn. Mount Holyoke is one of several examples in was not thrown up in its present form; on the contrary, it was leftwhen
. Elementary physical geography;. stor summit mate-rially higher thanthe rest forms apeak. Sometimesthe peak is a highcrag, or a pinna-cle of rock, butthe name is also applied to volcanic cones. Elevations thaiproperly are plateaus—as Broad Mountain, Pocono Moun-tain, and Broad Top, in the Appalachian system—arealso called mountains. Isolated peaks, or monadnocks, are not uncommon, hut for thegreater part they occur in mountain ranges that have been greatlyworn. Mount Holyoke is one of several examples in was not thrown up in its present form; on the contrary, it was leftwhen the rest of the range, being softer, was worn away. MountMonadnock, New Hampshire, a peak that has given its name to thetype, is a similar example. Isolated ridges or ranges are more commonthan isolated peaks, and excellent examples may be found in the GreatBasin. In some instances the apparent isolation is due to the fartthat the ranges are half buried, the exposed upper parts extending froma level plain of loose rock THE JURA MOUNTAINSA series oj gentle jolds, partly worn into ridges. PLAINS, PLATEAUS, AND MOUNTAINS 73 A mountain system is generally of great extent, severalof the more important exceeding four or five thousandmiles in length. A range, on the contrary, rarely exceeds afew hundred miles in length. It gradually takes form,continues a short distance, and then disappears, anotherrange to the right or the left taking its place. The rollinghills that form the approach to a system are called foot-hills or, better, piedmont lands. The hollow or depressionbetween adjacent ranges forms an intermontane valley; or,if wide and nearly enclosed, a park. A valley that extendsacross the range is called a pass, a gap, or a canon. Structure of Mountain Ranges.—In the simplest form,as in the Uinta Mountains, there is a single fold; in the Jura
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