The word geology appeared in the late 18th century. The pioneers of this discipline strove to understand the rises and retreats of the oceans or the formation of mountains.
Gohau relates how the scientists of the time explained the appearance of relief on the surface of the globe. He also explains what were the clues that would lead a German meteorologist, Alfred Wegener, to conjecture the continental drift in 1912.
This film is part of a series of 22 films entitled "Planet Earth Below the Surface".