![New Piedras Bola megaspherulites are being "born" every day as the soft layer of volcanic tuff in which they lie is weathered away.](/photos/7924-l-piedrasbola-p-new-piedras-bola-megaspherulites-are-being-born-every-da-large.jpg?1245497294 "New Piedras Bola megaspherulites are being "born" every day as the soft layer of volcanic tuff in which they lie")
New Piedras Bola megaspherulites are being "born" every day as the soft layer of volcanic tuff in which they lie is weathered away.
© John Pint, 2009
Source article: Las Piedras Bola: the great stone balls of Ahualulco
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