Polygonal columns are common in outcrops of magmatic rocks. Explained in ancient times as work of supernatural entities, geologists start to understand the forming mechanism, regulated by temperature, but still some mysteries remain.
from Forbes Real Time https://www.forbes.com/sites/davidbressan/2018/04/13/scientists-solve-part-of-the-mystery-of-how-the-columns-of-devils-tower-formed/
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