Lichened basalt columns at Stykkisholmur,Iceland. Basalt is an extrusive igneous rock,which means it forms from the cooling of lava on the surface. Contraction of the lava as it cools leads to the geometry of the columns,which have either hexagonal or pentagonal cross-sections | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Shaw, John |
Bildgröße: | 4228 px × 2801 px |
Modell-Rechte: | nicht erforderlich |
Eigentums-Rechte: | nicht erforderlich |
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