DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Columnar basalt rock in a disused quarry. Pentagonal or hexagonal columns of basalt are formed during the cooling of extrusive, igneous rock. This is rock that has formed from lava that has risen to the Earth's surface due to volcanic activity. More than 90 percent of volcanic rocks are basaltic. The geometric form of these basalts makes them ideal for use in construction. Photographed near Kasbach in the Eifel region of Germany.
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