sample of the week

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our featured sample this week can be found in abundance at Pamukkale in Turkey, where it flows from hot springs to cover the landscape. precipitating from the calcite-rich rich waters when they become exposed to the atmosphere, calcium carbonate forms a type of limestone called travertine. over the eons, it has built a series of cascading cliffs and pools – used since ancient times for bathing and healing

read more about Pamukkale in our latest column for AnOther