Around 30 years ago, two things happened that were to revolutionize the understanding of our home planet. First, geologists realized that the continents themselves were drifting across the surface of the globe and that oceans were being created and...
![В мире ориентиров [изд. 1966 г.]](https://www.rulit.me/data/programs/images/v-mire-orientirov-izd-1966-g_698465.jpg)
