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Tuesday, 20-Sep-2005 00:00
Yellowstone National Park - Mammoth Hot Springs
Here, mineral-rich water from hot springs has created huge terraces made of travertine. As hot water rises from underground through the rock, large quantities of limestone are dissolved and deposited at the surface when the water cools down, building the terraces. While travertine is normally a white material, bacteria that thrive in the hot water form large orange-brownish mats covering the surfaces. The terraces constantly grow where hot water flows over them and erode where the supply of water stops, thereby slowly changing shape over time.

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