43.1 MB (1.9 MB compressed)
4800 x 3136 pixels
40.6 x 26.7 cm ⏐ 16.0 x 10.5 in (300dpi)
SCIENCE SOURCE / SCIENCE PHOTO LIBRARY SCIENCE SOURCE / SCIENCE PHOTO LIBRARY
Engraving by Claude Fossard, de Veyrenc showing lava flowing down a volcano to form a street of prismatic basalt, 1778. Basalt is a very common igneous rock. Prismatic columns are formed when deep lava flows cool slowly, this causes shrinkage and the most popular form taken is hexagonal. The number of column sides does vary and some are almost square.
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