37.4 MB (1,012.4 KB compressed)
4252 x 3071 pixels
36.1 x 25.9 cm ⏐ 14.2 x 10.2 in (300dpi)
HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY HERVE CONGE, ISM / SCIENCE PHOTO LIBRARY
Basalt. Basalt is a common and widespread dark-coloured igneous rock. It forms as a result of the cooling of lava flows or small intrusions and is typically black. This specimen was found near Mount Etna, Italy.
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