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Mound Spring and Jupiter Terrace, Mammoth Hot Springs, Yellowstone National Park, Wyoming
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Jupiter and Mound Terraces display cycles of activity typical of Mammoth Hot Springs. Mound Terrace was inactive for decades but began flowing again recently.
Its weathered travertine shows new patterns where chunks of the soft rock have broken or fallen.
In the 1980s, Jupiter Terrace flowed heavily and overtook boardwalks several times.
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