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 below),
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.
See more Natural Wonders on earth
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