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. | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Science Source |
Bildgröße: | 4800 px × 3136 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
Restrictions: | - |