Publisher's Synopsis
Excerpt from Out of Door Studies in Geography, Vol. 2: The Formation of Mountain Ranges; A Study of the Sierra Nevada
Mountains are formed either by material thrown out of the interior of the earth by volcanic action; or through the elevation of the earth's surface by forces within the earth. The peaks and ridges, the canyons and valleys, and the other features which give mountains such a rugged surface, are the work of the tearing-down forces.
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