geology \Ge*ol"o*gy\, n.; pl. Geologies.
[Gr. ge`a, gh^, the earth + -logy: cf. F. g['e]ologie.]
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.