For the student able to penetrate the labyrinth of terminology and concepts associated with physical geography, this book should prove a valuable aid. Its purpose is to present and summarize what we know of the Earth in terms of its position in the Universe, its structure, the movements of rock, air and water. Beginning with an objective view of the Earth's relationship to other planets, the emphasis turns inward for an examination of the spinning ball itself. How the Earth functions as a clock, what goes on within the three-quarter portion covered by water, how theories of continental drift evolved, how mountain types (fold, block and volcanic) differ, are only a few of the questions explained. A new vocabulary is brought into play as the reader learns to define words like seismograph, igneous, erosion, tides, tundra. The volume in general will impress the reader with the multi-varied aspects of geology open for study by the keen observer.