Book excerpt: Geology gives a detailed study of rock-forming minerals and the rocks that are formed by it. The text analyses the forces which act on and within rocks. This subject belongs to physical geology. Historical geology is also covered in the book. This study explores the fossil content of the rock and reconstructs the earth’s history over the past million years. The subjects encourage the reader to go out and examine his surroundings. First chapter of the book focuses on the description of earth. Topics such as the shape, size, and motions of the earth are discussed. The second chapter of the text covers the chemical composition of minerals. Crystal system, crystallography, and crystal habits are included in the chapter. The physical properties and different types of minerals are also analyzed. Volcanism and all aspects of volcanoes are reviewed. The formation of soil and weathering is the topic of another chapter. The book will provide useful information to geologists, mineralogists, volcanologists, students and researchers of geology.