A practical guide for teaching geology outlines the three principal branches—dynamical, structural, and historical—and confines its treatment to surface processes and rock study. It explains how air, water, and organic activity drive erosion and weathering, illustrates chemical and mechanical breakdown of minerals with examples such as altered diabase, and traces the formation of soils from rock disintegration. The text proceeds to describe the composition, classification, and identifying features of typical minerals and rocks, and provides teachers with concise, classroom-oriented explanations and exercises for introducing mineralogy and petrography.