columnar jointing
Use Columnar jointing in a sentencecolumnar jointing
noun
(in basaltic igneous rocks) a series of generally hexagonal columns formed by vertical joints as a result of contraction during cooling.
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Columnar jointing
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Example sentences
Columnar jointing in the lava fans out to meet the canyon wall, staying perpendicular to the cooling surface.
You'll see quartz and feldspar and a great example of columnar jointing that forms a natural staircase.
Vertical borings do not disclose the nature of columnar jointing.
Good columnar jointing and other geologic formations.
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