From Germany into the world
Still in the 1970s and 1980s, pumice, gravel and concrete industries were omnipresent in the region around my hometown Andernach on Rhine in the German state of Rhineland-Palatinate. Gigantic excavators dug up the earth. They exposed the rock that occurred in layers, one atop of the other near the surface of the volcanic landscape, and that the manufacturers of hollow blocks and other concrete products urgently needed for their production.
Several production plants and supplier companies existed in every locality in the region. They were an important economic factor at the time, and many...
