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Sigillara specimen (bark removed), found in the Nordstern mine, Flöz Zollverein 2/3 at a depth of 1000m.. During the Carboniferous Period, in the Paleozoic era, which began 360 million years ago and ended 300 million years ago, layers of slate, coal and sandstone were formed. 400 to 300 million years ago, new mountains were uplifted during the Variscan mountain-building period.
Then the river marks the southern limit of the Ruhr area, passing Hagen, Dortmund, Herdecke, Wetter, Witten, Bochum, Hattingen, Essen, Mülheim, and Duisburg. The Ruhr area was Germany's primary industrial area during the early- to mid-20th century. Most factories were located there.
The 1911 edition of Encyclopædia Britannica has only one definition of "Ruhr": "a river of Germany, an important right-bank tributary of the lower Rhine". The use of the term "Ruhr" for the industrial region started in Britain only after World War I, when French and Belgian troops had occupied the Ruhr district and seized its prime industrial assets in lieu of unpaid reparations in 1923.
The area encompasses the western part of the Ruhr industrial region and the Cologne Lowland. Some of the larger cities in the Rhineland are Aachen, Bonn, Cologne, Duisburg, Düsseldorf, Essen, Koblenz, Krefeld, Leverkusen, Mainz, Mönchengladbach, Mülheim an der Ruhr, Oberhausen, Remscheid, Solingen, Trier and Wuppertal.
In the postwar period, Bochum began developing as a cultural centre of the Ruhr area. In 1965, the Ruhr University was opened, the first modern university in the Ruhr area and the first to be founded in Germany since World War II. Since the seventies, Bochum's industry has moved from heavy industry to the service sector.
The 12-meter level represents the region's pre-industrial memory and also includes the museum's collections on archeology, ethnology and natural history. On the 6 meter level the history of the Ruhr area in the industrial age is represented. Thus the museum is not only an industry museum, but presents a trias of nature, culture and history. [2]
In ninth grade, Zuri worked on a project to set up a small library for migrant girls. "I learned about book deserts through that," said Zuri, who said she has always been a voracious reader.
The Ruhr itself lies within the larger Rhine-Ruhr Metropolitan Region, one of Europe's largest conurbations. The city lies on both sides of the Rhine, with the city centre and most boroughs on the river's right bank, and is the only city of the Rhine-Ruhr region lying on both the Rhine and Ruhr rivers.