Inside the Earth, huge amounts of hot magma are under great pressure and are being pushed towards the surface.
Anyone who wants to learn more about tuff can easily find out about this rock and its uses in the 'Weiberner Schaufenster' ('Weibern Shop Window').
The history of the Mayener Grubenfeld begins with the eruption of the Bellerberg Volcano about 200,000 years ago.
A volcano erupts. Hot drops of lava are thrown out of the vent and fall onto other fragments of lava which have been spewed out during earlier eruptions.