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The bubbling springs at Hierve el Agua in Oaxaca, Mexico are rich in calcium carbonate and magnesium

The bubbling springs at Hierve el Agua in Oaxaca, Mexico are rich in calcium carbonate and magnesium

© Alvin Starkman, 2012 

Source article: Hierve el Agua: Bubbling springs and petrified waterfalls in Oaxaca, Mexico
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