What is an explanation for the fact, experimentally proven, that quartz sand grains are rounded much faster

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What is an explanation for the fact, experimentally proven, that quartz sand grains are rounded much faster by wind than by a river?
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Financial Accounting Theory and Analysis Text and Cases

ISBN: 978-1118582794

11th edition

Authors: Richard G. Schroeder, Myrtle W. Clark, Jack Cathey

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