The brochure shows that the modern balance of land and sea, and with it the peculiarities of climate and life, is just a brief moment in the history of the Earth. We live in the era of oceanization of the planet, which began about 60 million years ago. The causes and scale of this phenomenon on Earth are revealed, the situation on other planets is analyzed. The brochure is designed for lecturers, students and teachers of folk universities, teachers, as well as readers interested in the origin of the oceans.