| http://www.w3.org/ns/prov#value | - As the heat escaped, the basalt contracted from all sides, opening a network of cracks that divided the once-seamless surface into a forest of six-sided pillars. (Depending on the conditions when the lava cooled, the columns can have from four to seven sides.) These are called jointed basalt columns, and they can be found on every continent except Antarctica, with Giant's Causeway in Ireland and D
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