A book for those interested in acquiring a concise and simplified yet comprehensive general knowledge of geology, the science of the earth. The authors, university professors, with a writing style aimed at the general public, introduce the inexperienced reader to the fascinating world of geology and explore the basic functions of our living planet, from satellite level to microscopic observation. With original texts and rich illustrations that complement them with information, the rich philosophical, pedagogical, and practical content of geology is highlighted, making it a valuable educational resource for any thinking modern individual. This is particularly true for us Greeks, as our country is a real geological laboratory in full operation and, at the same time, a significant natural geological museum on a global scale.