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Excerpt from Geology of the Columbus Quadrangle These disintegrating processes are at work not only in the rocks which are actually at the surface, but also in those at some distance below, for the loose outer portion of the surface material is penetrated by the atmosphere while ground water may carry the active chemical agents to a considerable depth and there work changes similar to those which take place at the surface. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

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9781330119068

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