Rock circles. The spectacular concentric circles in this rock are sections through spherical structures formed by the crystallization of layers of different minerals around tiny cores. The rock crystallized from molten magma, but exactly how these structures are produced is not clear.
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Image Number: 1746-19666062Rights ManagedCredit Line:World History Archive/Image Asset Management/SuperStockCollection:Image Asset Management Contributor:World History Archive Model Release:NoProperty Release:NoResolution:3700×4933
