A chain of volcanoes of Kamchatka and the Kuril Islands stretches for almost two thousand kilometers. For many years, E.K. Markhinin, a traveler and scientist, studied their activities. His expeditions were often associated with great risk. Their main result was the volcanic theory of the formation of the outer shells of the Earth developed by E.K. Markhinin, which he talks about in a bright, popular form in this book.