Thermal cooling, especially of igneous rocks, results in the formation of regular patterns of joints.

Name: Thermal cooling, especially of igneous rocks, results in the formation of regular patterns of joints.
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When igneous rocks cool, they contract and this contraction often leads to the formation of regular patterns of joints or fractures. These joints are typically perpendicular to the cooling surface and can be seen in well-known formations such as Devil's Postpile in California.

Thermal Cooling, Especially of Igneous Rocks, Results in the Formation