This huge volcanic bomb formed from a clot of molten rock, or magma, that was ejected from a volcano. As the clot whizzed through the air, it solidified, assuming an aerodynamic shape.
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Details
Title: Basalt
Location: Chaîne des Puys, France, Europe
Type: Mineral
Rights: This image was obtained from the Smithsonian Institution. The image or its contents may be protected by international copyright laws. http://www.si.edu/termsofuse