Pandipedia entry
Giant's Causeway: Nature's Masonry
The Giant’s Causeway is made of thousands of basalt columns, fitted so closely that they have been compared to vertebrae. Cooling basalt cracks into these shapes wherever conditions are right. The same kind of formation appears at Fingal’s Cave on Staffa, with similar columns in South America and India. Across distant places, the same natural process creates something that looks like masonry.
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