原文 (英語)

and the Online Distributed Proofreading Team THE ELEMENTS OF GEOLOGY BY WILLIAM HARMON NORTON PROFESSOR OF GEOLOGY IN CORNELL COLLEGE PREFACE Geology is a science of such rapid growth that no apology is expected when from time to time a new text-book is added to those already in the field. The present work, however, is the outcome of the need of a text-book of very simple outline, in which causes and their consequences should be knit together as closely as possible,—a need lo