Fig. 7
Illustrations from Ampferer (1925) in support his ideas on continental drift and the role of convection currents. a Hypsometric curves of the Earth’s surface comparing different authors: above, Krümmel, in the middle, Wegener, and below, Ampferer. b The different geometrical and geological possibilities of accommodating space for ocean formation, from top to bottom: flexures, normal faults, stretching, and juvenile magmatic emplacement. c Stretching and breaking apart of continents by ascending and descending currents inside the Earth