Anyone who has ever taken a geology class has probably heard the explanation to explain columnar jointing in basaltic rocks—cracks that occur as the molten rock cools quickly due to its sudden emplacement in a much cooler setting than where it first melted. However, a friend of mine browsing the web today found a picture which shows another possibility for the long vertical lines that occur in cliffs of columnar jointed rock:
(The above image was found here.)
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