1) Ice age 
The Buskam, also Buhskam or Buskamen is a large glacial erratic boulder, 325 metres off the coast of Göhren, Rügen, northern Germany. Erratics (Findlinge) have been scattered all over northern Germany by the glaciers of the Ice Age, but are usually much smaller. The Buskam has a volume of about 600 m3, a circumference of about 40 metres, and wei...