Columnar Basalt

 
When a thick lava flow  cools it contracts vertically but cracks perpendicular to its directional flow  with remarkable geometric regularity - in most cases forming a regular grid of  remarkable hexagonal extrusions that almost appear to be made by man. One of the  most famous such examples is the Giant’s Causeway on the coast of  Ireland(shown above) though  the largest and most widely recognized would be Devil’s Tower in Wyoming. Basalt also  forms different but equally fascinating ways when eruptions are exposed to air  or water.

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