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Erongo Mountains

 

A mountain with volcanic origin, which looks like a volcanic crater with a diameter of 30 km. However, it is not a volcano. Magma was press to the surface, however, already cooled down before it reached the surface. There was a large underground cavity. Eventually, the surface collapsed and produced this crater.

More information can be found here:
http://en.wikipedia.org/wiki/Erongo_mountain

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