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From: Webster's Revised Unabridged Dictionary (1913)

 Ge·ol·o·gy n.; pl. Geologies
 1. The science which treats: (a) Of the structure and mineral constitution of the globe; structural geology. (b) Of its history as regards rocks, minerals, rivers, valleys, mountains, climates, life, etc.; historical geology. (c) Of the causes and methods by which its structure, features, changes, and conditions have been produced; dynamical geology. See Chart of The Geological Series.
 2. A treatise on the science.
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