@NinaByzantina Giant pebbles, formed by glacier movements 
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@Eumenes__ Articles about these round stones offer a dozen different explanations, including yours, as to how they formed.
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@NinaByzantina@ro_iain Concretions! Usually formed by grains rolling back & forth in a lagoon, etc. gathering layers like pearls.Thanks. Twitter will use this to make your timeline better. UndoUndo
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@NinaByzantina Spheres are not too common, in nature? Perhaps anyone may estimate if historic glaciers were on the island, those sculptors…Thanks. Twitter will use this to make your timeline better. UndoUndo
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Thanks. Twitter will use this to make your timeline better. UndoUndo
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