GNU Collaborative International Dictionary of English

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  1.       
    
    Geology , n.; pl. Geologies . [Gr. γέα, γῆ, the earth + -logy: cf. F. géologie.]
    1913 Webster
    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.
      1913 Webster
    2. A treatise on the science.
      1913 Webster

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